SSM2000

User Manual: SSM2000

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DataSheet

ssM2000

SolidStateMusic

VOTTAGE
DUALLII{EAR.ANTILOG
CONTROTTED
AMPTIFIER
each channef
The SSM20OO is a duaf two-quadrant multiplier,
signal inputs and a
harring ,"eparate control and differential
current output.
ln addition to linear amplilude control, on
n
v rhri r Pn
Tha

plcment.q

rI v n6 o6or irnr L5

antilog

control

r i o :vnr L. !F

aa\t

he

r"ui/

herre

heen

characterjstic
rrqpd

in

e

nnorrided

for

nrodtrcing

an

at the option of the designer.

nride

rnriet.rr

nf

attdin

fnenttencv

Mixdown
applications including Voltage Controlfed Amplifiersr
Both channefs are
Panels and as a Biquad T\rning Element.
temperature compensated and each channel has an 8O db range.

1 OUT
1+SIGIN
coN tNl
1 - S r Gr N
- Vcc
2-SrGlN
coN lN 2
2+stGtN

L O GE M I T1
DIODE1
GND
+Vcc
t o c E U t T2
DIODE2
vtR
2 OUT

116
215
314
413
512
611
710
89

TOP

APPLICATIONS
r Voltage Conlrolled

Filters

r Two and Four Q-radrant Multi-pliers
r Audio l,Lixdown Panels
lil-

r AGC Circuits
^V U^r*r ur f U- ^r ars u' - '
VU!UdBC
I

Current Sources

and Sinks
lN+

r Anlilog

Amplifiers

and Expanders

a Voltage Control-l-ed Quadrature
0sclflators
CON IN

FEATURES
r Linear or Antilog
teristi-cs
r BO db Control

Control- Charac-

Range

r Excelfent Control Accuracy (l% or
better over the entire control
range )
r Dral Design (completely independent selection of controL
nhapa

a-l

r Internal
r Current

ari

ci

_i n e \

Temperature Compensation
Output

r Differential

r 2OO Nanoamp Input
I

lcfi cotrnol

Sigrtal Inputs
Bias Current

Low Noise

a Low Dlrtortion

EOUTVALENT
SCHEMATTCIONEStDEI

Sofid State Music, 2102A Walsh Ave.,Santa Clara, CA 95O5O
9/76

t4o8l 246-2707

ssil

2()0()

SPECIFICATIONS
Min

20OnA 40OnA
84db

tttoise Siy'!.oise@1OVpp
-'Sig
in
Mal.nhi

2.5%
4
2.5% rq"
100db

Channel Separation
1

Sunpl-v Voltase

OV

Offset
/

|

= L2\l

1ov

O

bo
(!
+J
-l

1mA

o +;V

50 Meg 1OOMeg

Input Resistance
^+'t'c6i

f

-

Conlrol- Current

I

+/+V

nq

a - Linear
b - Antilog

-Output

ANTILOGCONTROLGRAPH

Bias

Signal Input
Current

llhrnnpl

Max

w

o

Current
^^nt

r^

|

o
q,'hhl

r'

Olroon*

@Icontrol-=1mA

-

10 mA 72nA

S i e n e l I n n r r t V n l t . a s e V^ ^ + l + . O V600

V, Resislor
V. R Temp. Comp.
Fri c* ar+
@

1

i ^l/nn

,'THn
Sio

V^^-2.5V

650

800

- +2OaoppnfCo -

luA

Tn

r(,'r:,t

Control Current

)

o.1 %

L I N E A RC O N T R O L( n o n i n v c r t l n g )

ANTILOG CONTROL

colrTRoL

Vcon : Rx lcon

IN
2N5ZrO
or aquly

Vin

2N52'lOor
2N930

ADJU5T 9oT Foc
60nV AlTOPOF
VtRQVtn=lV

dlodc

LOG EMIT
R1Cw"=1

f
l'"

- Vcc

-Rt
AUDIO
IN

)€ CONTROL
OP TMPS ( F o r a O d b r . n s . ) ;
LM -){)il, Te e ,'",e 1 . , 1 1
MC 1i9:,, or FET r r p':1,.

NOTCH

Low
PASS

Solid State Music

ssM 2000

Dual Linear-Antilog Voltage Controlled Amplifier

Application Note

Control

Circuits

is
voltage to current converter
in the SSM2000, a linear
control
of arnpllfication
To produce a linear
in Fig. A is used for a
The circuit
current
from an lnput voltage.
used to supply an output control
(Vc/R" = Ic),
in
voltage
The resistor
positive
control
and Fig. B for a negative voltage (-Vc/Rc = Ic).
produce an outptit cLrrrent
s h o u l d b e c h o s e n s o t h a t t h e m a x i m u r nd e s l r e d i n p u t v o l t a g e w i l l
these circuigs
has the advantage of hlgher input impedance and in Fig. B a larger co.ntrol
The Fig. A circuit
of 1 Mi1.
To "gang" the
pin (Vsg - 4V).
running into the bias voltage on the control
voltaqe can be used without
The 3.3K
in Flg. C is used.
the circult
voltage,
sain 5f boEh halves of the I.C to the same control
For the
current
liniting.
currents
in both amps and also offer
force a match in the control
resistors
I if a
B, and also ilr circuit
in clrcuit
latter
reason, lt may be a good idea to include such a resistor
sma11 Rs is

selected.

lile graph
in Fig. D.
converters
vollage to current
of gain ls achieved by the exponential
Atltilog control
Is to Vg in relationship
As can
aL the bottom of the page shows the Antilog
at varlous reference currents.
current
which is set up by the
is determined by the reference
be seen from the graph, Ehe range of control
= 100 nA etc.
is determined
1 decade per volt,
The scale factor,
in Figs. E and F; 80 db for lrs;
circuics
for 1 Volt at the control
input
which in this case gives 60 mV at the op amp non-lnvertlng
1.y the allenuator
input.
In the more general case:
= Rt vin/(Rl
+ R2).vr
vr = kT/q
ln(rclrref)

Control iraPh

Antitog

F i sA

v"fl

M

rootion"rrl
3'3*ll ,"

4V

<*

c

/

o
n
t

3v

f

:Rll

o
!

v

Vr"g=2v

f'
2N521Or

t/

2V

o
I
t
a

s

a

i.>
1v

Gnd

tOOnA

IOOuA
lOuA
luA
Control Currcnt

lll ll A

lro

Log cmit 1

1+Sig in

215

Diodc 1

Con in 1

314

Gnd

1- Slg in

413

*Vcc

- vcc

512

Log cmit 2

2- Slg in

611

Diodc 2

Con in 2

710

vtR

89

2 out

1 out

2*Sig in

Top View

S o fi d

State Music, 21O2A Walsh Ave., Santa Clara, CA

s/ ze

95050

14081246 -2707

Page 2

cancelled if the
can be largely
This effect
As one can see this expression is temperature sensitive.
range can be used
an 80db conlrol
Wlth this resistor
provided on the chip is used for R1.
Vr resistor
occur
This worst case error will
due to Eemperature over the span from l0oC to 45oC.
102 .ttor
,ittt.1
can be used as R1 for room temPerature
resistor
An ordlnary
in the range.
current
control
for Ehe largest
(100 to 1).
(ZSoC I fOoC) with only a LO% error lf the control
to 40db.
range is restricted
applicacion"
If extremely
o
f
3
3
0
O
p
p
m
/
C
o
.
c
o
e
f
f
i
c
i
e
n
t
a
t
e
m
p
e
r
a
t
u
r
e
w
o
u
l
d
h
a
v
e
compensatlng reslstor
temperature
An ideal
mode, a Tel Labs Type Q81 resistor
control
in the antilog
precise Vt temperagure compensation is requlred
uA726
is to use a Fairchild
Another alternative
o'. eq.,i,rai.nc can be used in place of the on chlp Va resi.stor.
In this case, no Va resistor
pair 1n place of the on chip logging elements.
Differentlal
Ternperature controlled
is

required.

a low lnput blas op amp such as the LM 308 or the Teledyne 844
is deslred,
range of 60db or greater
If a control
such as a 2N5210 or a 2N930. As with
should be used in ttre V to I converter wlth a low leakage output transitor
of the output
is placed 1n a series wlth the collector
a 3,3K resistor
clrcult,
control
inverglng
che linear
c
i
r
c
u
i
t
in Fig. G is
t
h
e
v
o
l
t
a
g
e
,
c
o
n
t
r
o
l
t
h
e
s
a
m
e
t
o
g
a
n
g
a
m
p
l
t
f
l
e
r
s
b
o
t
h
T
o
l
i
m
l
t
i
n
g
.
for current
transitor
used.

vq4
F i g , H s h o r ^ r sh a l f o f t h e 5 $ { 2 0 0 0 u s e d a s a v o l t a g e
current
by: .
and control
input voltages
Vout = Icon (V+ - V-) RF/1.06 x 10'

controlled

The output

arnpllfier.

voltage

is

related

to

the

current and the op anp converts the outpul
sets the control
converler
voltage to current
or antilog
A linear
ls necessary to prevent
in paral1el with the feedback reslstor
The capacitor
current to an output voltage.
g
i
v
i
n
g
a bandwidth of about 100KHz.
b
e
s
u
f
f
l
c
l
e
n
t
,
s
h
o
u
l
d
t
o
2
2
0
p
f
1
5
0
r
e
s
i
s
t
o
r
,
l
O
K
f
e
e
d
b
a
c
k
For a
oscillatlon.
ANTILOG VCA WITH I30db

C O N T R O LM N G E

with a
In Fig. | , both halves of the SSM200O are cascaded to produce an antl-log arnplifler
only from 500r:A to 250nA, maklng it
of Ehe devlce varles
in each half
current
The control
is
circuit
Ttre control
in excess of 50KHz down to the extreme low end.
bandwidth
a signal
I
f
p
r
e
v
e
n
t
o
s
c
i
l
a
t
i
o
n
.
t
o
n
e
c
e
s
s
a
r
y
w
a
s
f
o
u
n
d
t
h
e
.
0
2
u
f
c
a
p
a
c
i
t
o
r
p
e
r
v
o
l
t
;
g
a
l
n
10db of
w111 be
ls 68db and dlstortlon
to nolse ratlo
is kepE at 3 volts peak to peak, the signal

Four

Quadrant

Multiplier

of a SSM2000 ls used as a four
In Flg. J half
ground 1s:
-v1v2/R"(1.06
rout =
x l0r)
for proper
the circuit
To adjust
for mlnlrnrm feedthrough.
crinned
feedthrough

range.
130db control
possible
to maintain
designed to provide
level
the input signal
less Ehan 0.32.

which

should

occur

operatLon,
V2 ls then

quadrant

a slgnal
grounded,

The outDut

multipller

ls

applled

a slgnal

fo

the V2 lnput

applied

current

with

into

a virtual

V1 gounded and RO

to V1 and RF trlnmed

for

minimum

when:

. ^l

Rr.=1.06x10'/Ir"6
= 200 uA.
be obtalned with lr"g
A m a x l m u m b a n d w i d t h o f a b o u t 2 5 O l 4 1 Zw i l l
voltage.
to a buffered
the output current
the vcA can be added to convert
voltase

Controlled

Filt

ItLe op amp circuit

used with

er

range can be implernented.
with a 10,000 to I control
filter
controlled
In Flg. K a voltage
Using the circuit
and the
skirts
the band pass output has 6db/octave
rolloffs,
The ic'w and hlgh pass outputs have l2db/octave
can be serl-ed to produce more complex
Such clrcults
frequency.
at the cutoff
notch output has a sharp null
reslstors.
controlled
the SSM2000 can be thought of as a palr of natched voltage
In this appllcatlon
filters,
the control
ts l0.6Kwhen
given next to the figure
frequency
for the cutoff
The Rrln the deslgn equatlon
increase
the value of the R1will
current,
At
100uA control
in both hal-ves of the devl,ce 1s 1 Mil.
current
low input bias op amps should be used in
ranges of 1000 to 1 or greater,
For control
to 106K and so forth.
in the
The MC1456 and the Teledyne 844 perform well
of the fllter.
section
clrcuLt
and signal
the control
is used, the
control
If antllog
lovr nolse and wide power bandrsldth.
J-ow input bias,
section
offerlng
signal
of 250nA Eo 250uA.
currents
for control
greatest
accuracy for a 1000 to 1 range fu obtalned
control
(For other
filters
that can be used wlth
IEEE Spectrum, pp64-58, Dec. 1969).

the

2000 see J Tor^r, "A Step by

Step Active

Filter

Design"

Page 3
Fig 1{

vtR

,O2ul
vcc

vcA

220Pt

, 33Ks

1,"l'"

Sis

Y

In-

Sig in *
d iodes

trct:vfrFig J

22Opt
Input Altcnuator
Sig in

ionall +

f4-ury'^,

vcF
Dcrlgn Equrt ionr

Fig K

R= lOK
R1Cwo= 1
R.=212K@1.= SOOUA
'
R'J 12o'llR

3'3K

B a nd
Pase

H19h
Pase

6V Br

A= 2-1/Q

)l('

't'>T/

lK

-f

K-Y-R1

Notch
Low
Prss

Zeners needed t o p r € Y c n t
916
'
latch uP wh€n circult
is overdriven.

Pagc 4
Voltape

Controlled

Quadrature

Osclllator

controlled
to the voltage
shown l-n Fig. L ls very siml-lar
clrcult
oscillator
controlled
The voltage
circuit'
(approximately
.O47.) car^ be produced using this
slnewave
low dlstortion
An extremely
filter.
to tune a biquad sEage.
reslstors
the SSM2000 ls used as a pair of voltage controlled
As.in the f11ter,
The deslgn procedure ls:
A11 dhe desigrr tlps given for the VCF also apply here.

product of op amps in Hz)
@fr-uandwidth
P^(Output power in dbm)
impedance in ohms)
nl(cirluit
t?(center frequency in Hz)
in db)
D"(Total harrnonic distortion

l)

Peak limiter

voltage;

resistorl

4) Q setting

5) C: fo capacitorg

Yro=2Yrotfr
R*f

t6rfrf

o

R2=n3=1/ (z.,cf

)=27.2K@I.=5OOuA

6-V1p)/V]p
6 ) R7&RS; R7=R8=100(Vcc-O.
+

lD

1 ) P e a k o u t p u t v o l t a g e ; V p o = ( R o / 5 o o ) f1 0 " o u

/ -' " .' ] \

cc=t+/(tutcB.\)

7) e
"i

2) Transfer ratio;

Noise,

r-10((D-9)/20)=84

and Offset

Di-storElon

of the 2000 lnto a 10K nretal film
to nolse ratio
The output signal
current.
of the control
peak to peak 1s 72db tndependent
3 volts
dependent
is 1lnearly
harmonic dlstortlon
The total
12 with a 10 volt peak to peak signal and 0.12 with

reslstor

with

amplitude.
on the lnput slgnal
etc.*
a 1 volt slgnal,

an lnput

Typical

slgnal

of

values

are

Due to the
inputs.
than the slgnal
to the output rather
in Lhe 2000 is best thought of referred
Offset
of the control
appearing at the output w111 be a sma11 fractlon
nagure of the design, the D.C. offset
ls kept under 500uA,
current
grounded.
Tf the control
lnputs
2% wiXh both signal
Tlplcally,
current.
and l^Iith the wlper connected to
between fhe supplles
can be trlmned out by a pot stretched
the offset
inputs.
one of the slgnal
xhlnto.

rf fha ^ircuits
circuits
to gang both sides of the
C or G are used as control
in figures
is doubled and includes
the distortion
figure
some second
SSI12OOOto the same controJ- voltage,
will
avoid this.
with a conmon input
circuits
Using two control
harrnonic distortion.

V o l t a g c9 o n t r o l c 4 Q u e d r a t ur c O s c l l l a t o r

t
I
I

I
I
I
I
I
I
I
I
I

t_

Slnclw^tl

l Gi v e s * t a l
e dj u s t m . n t
or use 100K
I ixcdl

Coelwotl

Rt=100/L

l] 5197?
RECF-l\/[rAi:Fi

:
THe Gr Lsenr llulr I PLI ER IruElrctRot'ttclvlustc
-by Dave Rossun, Ep Systems, 3046 Scott Blvd.,

Santa Clara,

CA

95050

r eEaSd e n s a r e f a m i l i a r w i t h t h e R C AC A 3 0 8 0a n d i t s
Most ELECTRON0T
g
a
i
n
controlled stage in forming voltage controlled amplifjers
uses as a
T h e C A 3 0 B 0h a s i t s p r o b l e m s , a s m a n y r e a d e r s h a v e n o d o u b t
and filters.
d i s c o v e r e d . S o m eo f t h e s e c o m ef r o m p r o c e s s v a r i a t i o n s , m o s t l y d u e t o t h e
f a c t t h a t t h e P N Pt r a n. |s0' ,i s t o r s u s e d i n t h e p o s i t i v e r a i l c u r r e n t m ' i r r o r s
w h i c h , ' , ^ l h e tnh e p r o c e s s i n g i s p o o r , c a n g o t o m o r e
havebetas of around
l i k e 5 . B u t e v e n a t t h e ' i r b e s t , 3 0 8 0 ' s u s e d i n V C Aa p p l i c a l , i o n s a r e n o i s y
and causesignificant distorticin.
T h e 3 0 B Ct y p e m u l t j p l i e r , v r h e t h e rd i s c r e t e ( s e e E N S - 7 3d e s i g n f o r V C A
b y D a v e R o s s u m o) r i n t e g r a t e d , u s e s a d i f f e r e n t i a l i n p u t s t a g e s u c h a s t h a t
s h o w ni n f i g u r e 1 . l ' h e t w o o u t p u t c u r r e n t s , I i a n d 1 2 a r e t h e n s u b t r a c t e d
a n d c o n v e r t e d t o a v o l t a g e , e i t h e r b y t h e c u r r e n t m i r r o r a r r a n g e r n e nitn t h e
3080chip or by a differentjal amplifier jn the discrete design. The resulting
_ q l q g l q t _ E s ]t _r a n s f e r e q u a t j o n f o r t h e c i r c u i t i s t h e n :
- v-)
- v-)+t] r = q/ttT
Vo = R t. 1 .r(v+
;l
/ [ er(v+
T h u s w e s e e t h a t t h e c " i r c u ' i t i s b y n o m e a n sI i n e a r , a n d t o a v o i d g r o s s d i s t o r t i o n
t h e i n p u t v o l t a g c t o t h e t r a n s i s t o r b a s e so f t h e i n p u t s t a g e m u s t b e k e p t s m a 1 1 .
'into the stage;
l ^ l eh a v e t y p ' i c a ll y b e e n u s i n g t h e a t t e n u a t i o n o f l 0 0 K t o 2 2 0 o h m s
a t l 0 V p / p t l r i s c l i v e s a d i s t o r t i o n o f l . 3 i ( , . I f w e a s s u m el 0 m j c r o v o l t s o f n o ' i s e
at the trarrsjstor base, this q'ivesalso a worst case signal to noise ratjo of
6 6 d B , f o r t h e s a m el O V p / p s i g n a l .
O b v i o u s i y , i f r r e c o u l d i m p r o v et h e t h e o r e t i c a l t r a n s f e r c h a r a c t e r i s t i c t o
a m o r e I i r r e a l ^f o r m , r v e c o u l d i m p r o v e t h e d j s t o r t j o n . I f i n s t e a d w e c h o s e t o
incre:se nur signal level to tl':etransistor bases, we could use the improved
C i s t c r t j c l r 1 - cj n : t c a d ' l o ' , r e r t h e n o i s c . f n ' t u n a t e l y , a c j r c u i t l ; j i h s u c h a n
i m p r o v c dt r a n s f e r c h a r a c t e l ' i s t i c e xj s t s - i t i s c a l l e d a G ' i l b e r t r n utl j p l i e r .
T h e G j l b e r t m u l t i p l i e r d e r i v e s i t s i m p r o v e dp e r f o r m a n c eb y p r e - d i s t o r t i n g
t h e i n p u t s i . q n a l t o o u r a l r e a d y s h o w ng a i n c o n t r o l s t a g e . T h i s i s c j o n eb y a d d ' i n g
a p a i r o f m a t c h e dd i o d e s i n f r o n t o f t h e t r a n s i s t o r s , a n d m a k i n g t h e i n p u t a
d i f f e r e n t j a l c u r r e n t , a s s h o v r ni n f i g u r e 2 . T h e t r a n s f e r e q u a t i o n i s n o w :

vo = R r. [ (t* / i-) - 1) / [ (r* / r)+

t]

substrate w'ith the differential
Note that ir the diodes are on a common
of the gain disappears!
t h e t e m p e r a t u r ed e p e n d c n c e

pair,

IAS VOLTAGE
ttto

V-, Fig 1
+
V', Fig I

va-

F I G U R2E - P R E - D I S T O R T I O N

Ic
FIGUREI - B A S i CM U L T I P L I E R
E N # 6 7( 3 )

o r el j n e a r . I n f a c t , u s i n g t h e f u l l c i r c u i t
T h i s n e we q u a t i o nl o o k s a l o t m
'
i
d
e a l = l Iyi n e a r . T h e f i n a l e q u a t ' i o n ,i g n o r i n g
of figure 3, we f ind it is I inear,
t h e v i r i a t i o n i n V b e o f t h e i n p u t t F a n s i s t o r s ( w h i c hr e a ' l l y i s p r e t t y s m a l l ) i s :

ve=RI.(v+-u')/I'R'
I n f a c t t h e V g gv a r i a t j o n i n t r o d u c e s a v e r y s m a l l d i s t o r t i o n , a b o u t 0 . 2 %
f o r a 1 0 V p / ps i g n a l . B u t l o o k w h a t w e c a n d o t o t h e s i g n a l s a t t h e v a r i o u s
h a s t h e f u l l l 0 V p / p a c r o s si t ; w i t h
e0
t r a n s j s t o r b a s e s . T h e f j r s t i n p u t s t a.g| 2
j
s
d B . T h e s e c o n dp a i r , o u r o l d f r i e n d s ,
l 0 m i c r o v o l t n o ' i s yt r a n s j s t o r s S / N
c a n a l s o h a v el a r g e s i g n a l s , l i k e 2 0 0 m V , f o r a n o t h e r2 0 d B o r 8 6 d B S / N . M u c h
better.

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VOLTAGE

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ll

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TU L T I P L I E R
F I G U R3E - G I L B E RM

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s o m em a t c h e dp a i r s . A l s o t h e i n p u t s t o t h e a m p l i f i e r a r e n o l o n g e r s u m m i nngo d e s ;
g u s t b e d o n eb y e x ' t e r n a lo p - a m p s .
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F i g u r e { - s h o w sa b a s i c b l o c k d " i a g r a m
l . B a dn e v r s : t h e c h i p i s d e s i g n e dw i t h 2 4 v o l t b r e a k d o w na,n d u s e f r o m t l 5 v o l t
s u p p l i e s i s n ' t r e c o m m e n d e dH.o r i e v e r I, ' v e s p e c c h e c k e d8 c h i p s a t t h e h i g h e r s u p p l y
v o l t a g e a n d a ' l l w o r k e df i n e w i t h n o n o t i c a b l e l e a k a g e . T a l k j n g t h i s o v e r w i t h R o n ,
w e d e i i d e d t h a t t h e t h i n g s " s h o u l d "w o r k 0 K a t t l 5 V f o r m o s t a p p l i c a t ' i o n s ,a s n o
N P Nc o l l e c t o r i n t h e d e v i c e e x c e e d s2 3 V ' i n s u c h o p e r a t ' i o na n d t h e s p e c i s 2 4 Vm i n .
S o u s e t h e m ,b u t b e w a r e .
F i g u r e 5 s h o w sa l i n e a r V C A ,a n e x p o n e n t i a ' l 1cyo n t r o l l e d V C Aa n d a V C F ,u s i n g
m o r eo r l e s s t r a d ' i t j o n a l t e c h n i q u e s . N o t e f o r t h e b i q u a dV C Fs h o w n ,s o m el i m i t i n g
d i o d e sm u s t b e a d d e da s t h e i n p u t s t a g e t o t h e G j l b e r t m u l t ' i p ' l i e r i s s u b j e c t t o
l a t c h - u p i f o v e r d r i v e n . T h i s d i o d e sw o n ' t t u r n o n i n n o r m a lo p e r a t i o n .
EN/l67 (4)

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FIGURE4 - SSI'I2OOODUALVCA

MIN

PAMNTTER
Signal InPutBias Current
I n p u t R e si s t a n c e

50
Vee+4

Siqnal InPut Voltage
N o is e
Distortjon (tH0) lV P/P signal
0utput Offset Current
L'in
C h a n n e lM a t c h i n g
E x p '1
C h a n n e lI s o l a t i o n
Control Current
S u p p l y V o lt a g e
Supply Current

.|00

TYP
200
100
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a b o v e ,a g r o u po f t h e s e I C ' s a n d f o u n d a f e w s p e c st h a t
, s mentjoned
I c h e c k e da
o u q h t t o b e r e p o r t e d . T h e n o j s e w a s i n c r e d i b i y 1 o w , b e t t e r t h a n B 0 d B d o w n( v i r t u a l l y
i n a u d ' i b l e ) . T h e c o n t r o l r e j e c t i o n v a r i e d a l o t , b u t a v e r a g e da b o u t 4 0 m Vf o r a s w e e p
f r o m 0 t o u n ' i t y o a i n ( a b o u t5 0 d B ) . T h ec o n t r o l r e i e c t ' i o n j n f i l t e r c i r c u i t s v r a s
w o r s e ,a v e r a g i n ga b o u t 5 0 0 m V ( 2 6 d B ) f o r a l 3 o c t a v e s v r e e p .- 0 n ep a r t . i g o t w a s n o t
t o t a l i y t u n c l i o i a l ; I c a n n o tv o u c hf o r t h e t e s t i n g o n p a r t s f o r s a l e ( m i n ew e r e
untested
).
h e s e , t h e I C i s c a l l e d t h e S S M2 0 0 0 ,
I f y o u a r e i n t e r e s t e d i n p r r r c h a s ' i nt g
j
c
a v a i l a b l e t h r o u g hS o li d S t a t e l t l u s , 2 1 0 2 AW asl h A v e . , S a n t aC l a r a , C A 9 5 0 5 0 . I
d o n ' t h a v ef j r m p r i c e s , b u t v l a st o ' l d p a r t s v r i l l b e a b o u t $ 6 i n o n e s , d r o p p ' i n gi n
a n y q u a n t i t y . B e s t t h i n g t o c l o i s y r r i t e f o r a s p e cs h e e ta n d a p n o t e s , a n d a s k
a b o u tp r i c e s .
E N i l 6 7( s )

g.

Linear: VCA, !>
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