SSM2033

User Manual: SSM2033

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SoUdSlcile

Mlcro
Technologry

SSM
2033

lor Music

OSCILLATORVOLTAGE
CONTROLLED
DESCRIPTION
T h e S S M 2 0 3 3 i s a p r e c i s i o nv o l t a g e c o n t r o l l e d o s c i l l a t o r d e s i g n e ds p e c i f i c a l l y f o r t o n e g e n e r a t i o n i n e l e c t r o n i c m u s i c . l t h a s s a w t o o t h , t r i a n g l e , a n d v a r i a b l e w i d t h p u l s e o u t p u t s . S i m u l t a n e o u se x p o n e n t i a l a n d p r o p o r t i o n a l l i n e a r s w e e p i n p u t s c a n c o n t r o l
o p e r a t i n g f r e q u e n c y o v e r a 5 0 0 , 0 0 0 - t o - 1r a n g e .O n - c h i p l o w i n p u t b i a s s u m m e r a n d c o n t r o l o p a m p s h a v e b e e n p r o v i d e d . T h e p u l s e
c o m p a r i t o r , w h i c h h a s b u i l t - i n h y s t e r e s i sf o r c l e a n s w i t c h i n g , c a n c o n t r o l p u l s e w i d t h d u t y c y c l e f r o m 0 t o 1 0 0 % . H a r d a n d s o f t
s y n c i n p u t s m a k e p o s s i b l ea r i c h v a r i e t y o f m o d u l a t i o n a n d h a r m o n i c l o c k i n g e f f e c t s . l n a d d i t i o n , t h e o p e r a t i n g t e m p e r a t u r e o f t h e
c h i p i s r e g u l a t e d m a k i n g e x t e r n a l t e m p e r a t u r e c o m p e n s a t i o n u n n e c e s s a r y .O n l y o n e t r i m ( v o l t s / o c t a v e ) i s r e q u i r e d f o r n o r m a l
operation.

FEATURES
t
I
I

I
I

F u l l o n - c h i pt e m p e r a t u r ec o m p e n s a t i o n .
500,000-to-1sweeprange.
S i m u l t a n e o ussa w t o o t h ,t r i a n g l e a
, ndvariable
w i d t h p u l s eo u t p u t s .
S i m u l t a n e o uesx p o n e n t i aal n d p r o p o r t i o n a l i n e a r
sweepinputs.
O n - c h i ps u m m e ra n d c o n t r o l o p a m p s .
Excellentexponentialconformity.

I
I
I

!
I
t

All outputs are short circuit protected.
Hard and soft sync inputs.
P u l s ed u t y c y c l ev o l t a g ec o n t r o l l a b l ef r o m 0 t o
100%
Pulsecomparitor hasbuilt-in hysteresis.
100 nsecsawtooth discharget''ne.
O n l y v o l t s / o c t a v et r i m r e q u i r e df o r n o r m a l
operation.

CFT 'V
I

CRT +V

H E A T+ V

t-1

-V

2

17

HFT

T R IO U T

3

16

EXPO

S O F TS Y N C

4

15

LIN

SUM IN

5

14

B A S EG N D

BASE
GND

,OA

SUMOUT

6

13

P U L S EM O D I N

7

12

SAWOUT

P U L 6 EO U T

8

11

H A R DS Y N C

C I RG N D

I

10

H E A TG N D

P I N O U T ( T O PV I E W )

S o l i d S r a r eM i c r o T e c h n o l o g yf o r M u s i c , I n c . , 2 0 7 6 8 W a l s h A v e n u e ,S a n t a C l a r a ,C A 9 5 0 5 0 , U S A
l408l 727-0917 Telex 171189

B L O C KD I A G R A M

. P A T E N T SA P P L I E DF O R
R E V I S E D5 8 1

SPECIFICATIONS*

TEMPERATURE
OPERATING

S T O R A G ET E M P E R A T U R E

25"C

-10"C to +55oC

- 5 5 o Ct o + 1 2 5 " C

L EFERENCE
* V = * 1 5 V . - V = I N T E R N AR
PARAMETER
Positive
S u p p l yC u r r e n t
Max HeaterCurrent
PositiveSupply VoltageRange
N e g a t i vS
e u p p l yV o l t a g eR . n g " ( 1 )
Sweep Range

MIN

TYP

8.0
30.0

r0.5

9.0
4.5

15
-15

250K:1

I n t e g r a t o rI n p u t B i a sC u r r e n t
Control Circuit Offset
M a x O p e r a t i n gF r e q u e n c y
M a x C h a r g i n gC u r r e n t

-5.0
27
270

E x p o n e n t i a lS c a l eE r r o r
Sawtooth Peak Level

9.75

Sawtooth DischargeLevel
Sawtooth DischargeTime
Sawtooth Output Short Circuit Current
Triangle Peak Level
T r i a n g l eT r o u g h L e v e l
T r i a n g l eO u t p u t S h o r t C i r c u i t C u r r e n t
P u l s eU p p e r L e v e l
Pulse Lower Level

5.6
4.75
-250
I
5.8
-100

37

1M:1
0.3
0
33
330
0.05
10.0
200
100
7.5
5.0
0
11
6.5
0

MAX

UNITS

13.3
45
18
-18

mA

1

nA

+5

mV

44

kHz

440

sA

o.2

%

10.25
350

V

mA
V
V

9.4

mA

5.25
+250

V

14
7.2
+100

mV
mA
mV

P u l s eR i s eT i m e

3

psec

Control and Summer Op Amps
Input Offset Voltage
lnput Offset Voltage Drift
Input BiasCurrent
l n p u t B i a sC u r r e n t D r i f t
Frequency Drift With Temperature
Basic Loop
With Exoonential Converter(z)

Not6:

-5

6.0

pA

+5

mV
pVlC"
nA
pA/Co

o.2
40
50
-20
-r00

( 1 ) S e r i e sc u r r e n t l i m i | n g r e s i s t o rr e q u i r e dt o r n e g a t i v es u p p l i e sg r e a t e rt h a n - 6 V

250

V p i n3 : G N D

V
pseC

2.O

-90 mV < V^< +90m!

mV

1
0.75

C = 1000 pf

nsec

P u l s eF a l l T i m e

P u l s eM o d u l a t i o n I n p u t B i a s C u r r e n t

CONDITIONS

Pin8 has15K to GND

@ 50HZ
VpinT)Vpin12

o"c < TA<45oc
odc< To<4s"c

+20
+100

ppm/Co
ppm/C"

V" = GND
V" = i26 mV

'Final specifications may be subiect to change.

(2) Unco*pensated drift under the same conditions is 33OOppm/C' @ 25'C.

The schematicaboveshow the typical connection of the SSM 2033 as an electronicmusic VCO. The control circuit section is
redrawnfor easyreference(figure 1). Any number of input voltagescan be summedby amplifierA1 which drivesthe exponential
input attenuatorto pin 16. Amplifier A, forcesthe current in Q1 to be equal to the sum of the referencecurrent,established
by
Rr, and the linearFM voltage.The current in the output transistor02 is:
-V^qi kT
E'
EKT = 3 1 . 1m V @ 8 5 " C
lo=(V+/Rl+VL/R2)e
q

Propagataon
delayand dischargetime can cause a deviationf rom true exponentialityal lrequenciesabove5kHz.To correctfor this
effect,transistorQ3providesfeedbackto the exponentialcontrolinput.At lowf requencies(currents),
Q3will havea negligibleeffecton
the voltageat the baseof Q.'.At highf requencies(currents),
Q3 will correctfor the tendencyof the oscillatorto trackflat.Since 5kHz
is aboutthe upperlimitfor mostmusicalapplications,pin 17 can be groundedand R3and R4replacedwith a 1 K 1%resistor.Foraccurate operationabove5kHz, R3 Ro are chosen to give a true last octave.

+V (UNREGULATED)
3 . 0 1 M1 %
INPUT(OPTIONAL)

T

+

.

SI
UN
MP
MU
ET
R (S)

lOOK1%
I

r o o xr c 6 l
looK'l
PULSEMOD
INPUT
1OOOpf PULSE
OUT

(GNDPINs)

"
-l ? l,"t (GNDPlN10)
t-:-

1

18

2

17

3

16

4

15

5

14

6
7

13
't2

I

11

o

10

1o/o

3.3K

54.9K
1%

o.tpt

15K
GND (HEAT)

HARD

GND (CRT)

lOOOpt

2.2K

i-"J,?>-(OPTIONAL)

'Polystyrene
* * C e r a m i c ( L o c a t e c l o s e t o l . C .)

T Y P I C A LC O N N E C T I O N

l".r
l

V/OCTAVE
100K

10 0 K

1o/o

1o/"

1.5M

O.1pf

R' = 3.01M 19"
47tl
0.1sf

100K
'lo/"

100K

54.9K

1o/o

1o/"

3.3K

r

100Opf
V"=V+%
(
., --V"
55.9K
"

R.
1o/"

R.+fu=16

I
I
I

I

+

F I G U R ET _ C O N T R O LC I R C U I T
The SSM 2033 has an on-chip temperature sensor and heater which regulates the chip temperature to 85'C. The kT/q term in the
exponent of the equation above is now a fixed value independent of ambient temperature. Operating temperature is reached
30 to 40 seconds after device power-up. Current drawn by the heater will decreaseas ambient temperature rises.The temperature
stabilization also insures that errors caused by offset drift with temperature in the summer and control op amps will be extremely
small. (SEE NOTE LAST PAGE.)

T h e o u t t l u t c u r r e n t o i t h e c o n t r o l c i r c u i t i s f e d t o a n i n t e g r a t i n ga m p l i fr e r w h r c h c r e a t e st h e s a w t o o t hw a v e f o r m .T h e i n s t a n t a n e o u s
sawtooth output is compared to a reference voltage that is two-thirds of the positive supply. Sawtooth discharge is accomplished
by a capacitorlessone-shot which delivers a pulse to the dischargetransistor when triggered by comparator C1.
The triangle converter and pulse width comparator shape the sawtooth to provide the other two waveform outputs. The 27K
resistor between the positive supply and the soft sync pin centers the sawtooth for proper triangle conversion. Comparator C2
compares the pulse width modulation input voltage to the instantaneous sawtooth output to create a pulse that can have a duty
cycle between 0 and 100%. The control range on the PWM input is between 0 and 10 V. C2 has about 180 mV of built'in hysteresis
to give fast clean transistions on both the rising and falling edgesof the output.
The hard and soft sync features provide additional means for timbre modulation and additive synthesis.The hard sync input senses
a falling edge. such as another 2033's sawtooth discharge, and forces an immediate discharge of the synced 2033. The resulting
waveform has a complex harmonic structure whose pitch is that of the incoming oscillator (figure 2). The soft sync input also
. hisenables
a c c e p t sa f a l l i n g e d g e b u t i t w i l l f o r c e d i s c h a r g eo n l y i f t h e s y n c e d 2 0 3 3 i s w i t h i n 2 4 0 K l ( R 3 + 2 . 4 K 1 % o f d i s c h a r g e T
one to phase-lock two oscillators to freguencies that are exact small integer ratios of one another (figure 3). By mixing the waveforms of the two oscillators, complex additive synthesis can be performed.
stabilizedaflersystemlurn on can be eliminatedby wiringthe powefsupplyso lhat the
NOTE:Thetime requiredf or the 2033 (s)lo becometemperature
oscillatorsoperaleas long as the systemii puggedin. Thisis similarto the "instanton" featurein tube T.V.sets.

--10v

HARD I
SYNC lN r

>--l

1000pf

t-

SAWTOOTH'
OUTPUT :

PIN 11 3.6K
(TNTERNAL)

HARD
SYNCIN

GND

GND

TO INTERNAL
LOGIC
F I G U R E2 _ H A R DS Y N C

R5= 22K 3,o9ef

>-*--l
SOFT
SYNC
IN

hT

3.6K
(TNTERNAL)

SOFT
SYNC
IN

TO C1
7.2K
(TNTERNAL)

-----l

9V

SAWTOOTH
OUTPUT
GND
FIGURE3_ SOFT SYNC

SoUdStcrteMlcro

ffir

Teghnologry
!'
lor Music

@t s o s o L r Ds r A T E M r c R or E c H N o L o c y . A L L R T G H TR
SE S E R v E D .
Solid State Micro Technology cannot assume responsibility for use ol any circuitry dercribed oth€r than the circuitry entirely embodied in an SSMT
p r o d u c t . N o o t h e r c i r c u i t l i c e n s e sa r e i m p l i e d . S o l i d S t a r e M i c r o T e c h n o l o g y r e s e r v e st h c r i g h t . a t a n y t i m a w i t h o u t n o t i c e , t o c h a n g e s a i d c i r c u i t r y .



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