Gennum GS9002-CPM Genlinxtm gs9002 serial digital encoder Datasheet

GENLINX ™ GS9002
Serial Digital Encoder
DATA SHEET
FEATURES
DEVICE DESCRIPTION
• fully compatible with SMPTE-259M serial digital
standard
The GS9002 is a monolithic bipolar integrated circuit designed
to serialize SMPTE 125M and SMPTE 244M bit parallel digital
signals as well as other 8 or 10 bit parallel formats. This device
performs the functions of sync detection, parallel to serial
9
4
conversion, data scrambling (using the X + X +1 algorithm),
10x parallel clock multiplication and conversion of NRZ to
NRZI serial data. It supports any of four selectable serial data
rates from 100 Mb/s to over 360 Mb/s. The data rates are set
by resistors and are selected by an on-board 2:4 decoder
having two TTL level input address lines.
• supports up to four serial bit rates to 400 Mb/s
• accepts 8 bit and 10 bit TTL and CMOS
compatible parallel data inputs
9
4
• X + X + 1 scrambler, NRZI converter and sync
detector may be disabled for transparent data
transmission
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
• pseudo-ECL serial data and clock outputs
Other features such as a sync detector output, a sync detector
disable input, and a lock detect output are also provided. The
9
4
X + X + 1 scrambler and NRZ to NRZI converter may be
bypassed to allow the output of the parallel to serial converter
to be directly routed to the output drivers.
• single +5 or -5 volt supply
• 713 mW typical power dissipation (including ECL
pull-down loads).
• 44 pin PLCC packaging
The GS9002 provides pseudo-ECL outputs for the serial data
and serial clock as well as a single-ended pseudo-ECL output
of the regenerated parallel clock.
APPLICATIONS
• 4ƒSC, 4:2:2 and 360 Mb/s serial digital interfaces for
Video cameras, VTRs, Signal generators
The GS9002 directly interfaces with cable drivers GS9007,
GS9008 and GS9009. The device requires a single +5 volt or
-5 volt supply and typically consumes 713 mW of power while
driving 100 Ω loads. The 44 pin PLCC packaging assures a
small footprint for the complete encoder function.
ORDERING INFORMATION
Part Number
Package Type
GS9002 - CPM
SCRAMBLER/
SERIALIZER
SELECT
SYNC DETECT
DISABLE
PARALLEL DATA
IN (10 BITS)
Temperature Range
44 Pin PLCC
0° to 70°C
26
3
6
2:1 MUX
7-16
INPUT
LATCH
SYNC
DETECT
38
39
P/S
CONVERTER
SYNC DETECT
SERIAL DATA
SERIAL DATA
SCRAMBLER
NRZ
NRZI
42
PLD
SCLK
43
LOCK
DETECT
PCLK IN
LOOP FILTER
PCLK OUT
PHASE
FREQUENCY
DETECT
17
CHARGE
PUMP
20
29
VCO
22
36
DATA RATE
SWITCH
19
DIV BY 10
GENERATOR
35
34
33
32
GS9002
31
SERIAL CLOCK
SERIAL CLOCK
LOCK DETECT
REGULATOR CAP
DRS0
DRS1
RVC00
RVC01
RVC02
RVC03
Patent No.5,357,220
FUNCTIONAL BLOCK DIAGRAM
Revision Date: March 2001
Document No. 520 - 27 - 08
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Gennum Japan Corporation C-101 Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan
tel. (03) 3334-7700
fax (03) 3247-8839
GS9002 - ENCODER DC ELECTRICAL CHARACTERISTICS
VCC = 5V, VEE = 0V, TA = 0°C to 70°C unless otherwise shown
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4.75
5.0
5.25
V
-
690
870
mW
Same as above with SCK/SCK
also connected to (V CC-2V)
thru 100Ω resistors.
-
710
900
mW
SDO/SDO connected to (VCC-2V)
thru 100Ω resistors, PCK OUT
connected to VEE via 1kΩ
-
155
190
mA
-
170
205
mA
Supply Voltage
VS
Operating Range
Power Consumption
PD
SDO/SDO connected to (VCC-2V)
thru 100Ω resistors, PCK OUT
connected to V EE via 1kΩ
IS
Supply Current
NOTES
D
E
D
S
N
E GN
M SI
M
E
O
D
C
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R EW
T
N
O
N OR
F
Same as above with SCK/SCK
to (VCC-2V) V thru 100Ω resistors.
TTL Inputs-HIGH
VIHmin
TA = 25°C
2.0
-
-
V
TTL Inputs-LOW
VILmax
TA = 25°C
-
-
0.8
V
Logic Input Current
IINmax
-
2.5
10
µA
TTL Outputs-HIGH
VOHmin
TA = 25°C
2.4
-
-
V
TTL Outputs-LOW
VOLmax
TA = 25°C
-
-
0.5
V
IOSYNC
Sync Detect O/P
Serial Outputs
High
VOH
TA=25°C, RL=100Ω to VCC-2V
(SDO & SCK)
Low
VOL
(V CC-2V)
-
-
4.0
mA
-0.875
-
-0.7
V
-1.8
-
-1.5
V
see Figure 15
SINK & SOURCE
with respect to V
CC
GS9002 - ENCODER AC ELECTRICAL CHARACTERISTICS
VCC = 5V, VEE = 0V, T A = 0°C to 70°C, V LOOP FILTER =2.6 V unless otherwise shown,
PARAMETER
Serial Data Outputs
(SDO and SDO)
Serial Clock Outputs
(SCK and SCK)
SYMBOL
bit rates
BRSDO
signal swing
VSDO
rise/fall times
tR, tF
jitter
t J(SDO)
frequency
ƒSCK
signal swing
VSCK
CONDITIONS
MIN
TYP
RL = 100Ω to
(VCC-2 volts)
100
-
400
Mb/s
700
850
1000
mV p-p
-
500
-
ps
20% - 80%
-
400
300
-
ps p-p
ps p-p
see Note 1
see Fig. 16
RL = 100Ω to
(VCC-2 volts)
100
-
400
MHz
see Fig. 12, 13
-
800
-
mV p-p
see Fig. 14
Data lags Clock
TA = 25°C
143 Mb/s
270 Mb/s
MAX
UNITS
Serial Data to Clock Timing
tD
See Figure 9
-
1.4
-
ns
Lock Time
tLOCK
CLOOP FILT = 0.1µF
RLOOP FILT = 3.9kΩ
-
1
1.2
ms
frequency
ƒPCKO
RL = 1kΩ to VEE
10
-
40
MHz
signal swing
VPCKO
-
800
-
mV p-p
rise/fall times
tR, tF
-
700
-
ps
jitter
t JPCKO
-
400
-
ps p-p
500
-
-
ps
Parallel Clock Output
(PCK OUT)
Parallel Data & Clock Inputs
risetime
tR
TA = 25°C
setup
tSU
3
-
-
ns
hold
tHOLD
3
-
-
ns
NOTE 1: Measured using PCK-IN as trigger source on 1GHz analog oscilloscope.
520 - 27 - 08
2
NOTES
ƒPCKO = ƒSCK/10
20% - 80%
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE/UNITS
Supply Voltage
5.5 V
Input Voltage Range (any input)
-VEE < VI < VCC
DC Input Current (any one input)
10 mA
Power Dissipation (VS = 5.25 V)
1W
0°C ≤ TA ≤ 70°C
Operating Temperature Range
-65°C ≤ TS ≤150°C
Storage Temperature Range
260°C
Lead Temperature (soldering 10 seconds)
D
E
D
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N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
SYNC
DET.
DIS. VCC1
6
PARALLEL
DATA
INPUTS
5
VEE
4
SYNC
DET. VCC3
3
VEE
2
VEE
SCK
SCK
44
43
42
VCC2a
41
VCC2b
40
PD0
7
39
SDO
PD1
8
38
SDO
PD2
9
37
VEE
PD3
10
36
DRS0
PD4
11
35
DRS1
PD5
12
34
RVC00
PD6
13
33
RVC01
PD7
14
32
RVC02
PD8
15
31
RVC03
PD9
16
30
VEE
PCK IN
17
29
C. REG
GS9002
TOP VIEW
18
19
20
VEE
PCK
OUT
LOCK
DET.
21
22
VCC3 LOOP
FILT.
23
24
25
26
VEE
NC
VEE
SSS
27
VEE
VCO
FREQUENCY
SET
RESISTORS
28
VCC3
Fig. 1 GS9002 Encoder Pin Connections
3
520 - 27 - 08
GS9002 Serial Digital Encoder - Detailed Device Description
The GS9002 Encoder is a bipolar integrated circuit used to
convert parallel data into a serial format according to the
SMPTE 259M standard. The device encodes both eight and
ten bit TTL-compatible parallel signals producing serial data
rates up to 400 Mb/s. It operates from a single five volt supply
and is packaged in a 44 pin PLCC.
VCO Centre Frequency Selection
The wide VCO pull range allows the PLL to compensate for
variations in device processing, temperature variations and
changes in power supply voltage, without external adjustment.
A single external resistor is used to set the VCO current for
each of four centre frequencies as selected by a two bit code
through a 2:4 decoder.
Functional blocks within the device include the input latches,
sync detector, parallel to serial converter, scrambler, NRZ to
NRZI converter, ECL output buffers for data and clock, PLL for
10x parallel clock multiplication and lock detect.
The current setting resistors are connected to the RVCO0
through RVCO3 inputs (34, 33, 32 and 31). The decoder
inputs DRS0 and DRS1 (36, 35) are TTL compatible inputs
and select the four resistors according to the following truth
table.
D
E
D
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N
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M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
The parallel data (PD0-PD9) and parallel clock (PCK-IN) are
applied via pins 7 through 17 respectively.
Sync Detector
DRS1
The Sync Detector looks for the reserved words 000-003 and
3FC-3FF, in ten bit Hex, or 00 and FF in eight bit Hex, used in
the TRS-ID sync word. When the occurrence of either all zeros
or ones at inputs PD2-PD9 is detected, the lower two bits PD0
and PD1 are forced to zeros or ones, respectively. This makes
the system compatible with eight or ten bit data. For non SMPTE standard parallel data, a logic input, Sync Disable (6)
is available to disable this feature.
Scrambler
Resistor Selected
0
0
RVCO0 (34)
0
1
RVCO1 (33)
1
0
RVCO2 (32)
1
1
RVCO3 (31)
A 2:1 multiplexer (MUX) selects either the direct data from the
P/S Converter (Serializer) or the NRZI data from the Scrambler.
This MUX is controlled by the Scrambler/Serializer Select
(SSS) input pin 26. When this input is LOW the MUX selects
the Scrambler output. (This is the mode used for SMPTE
259M data). When this input is HIGH the MUX directly routes
the serialized data to the output buffer with no scrambling or
NRZ to NRZI conversion.
The Scrambler is a linear feedback shift register used to
pseudo-randomize the incoming serial data according to the
fixed polynomial (X9+X4+1). This minimizes the DC component
in the output serial data stream. The NRZ to NRZI converter
uses another polynomial (X+1) to convert a long sequence of
ones to a series of transitions, minimizing polarity effects.
Phase Locked Loop
The lock detect circuit disables the serial data output when the
loop is not locked by turning off the 2:1 MUX. The Lock Detect
output is available from pin 20 and is HIGH when the loop is
locked.
The PLL performs parallel clock multiplication and provides
the timing signal for the serializer. It is composed of
a phase/frequency detector, charge pump, VCO and a
divide-by-ten counter.
The true and complement serial data, SDO and SDO are
available from pins 38 and 39 while the true and complement
serial clock, SCK and SCK are available from pins 43 and 42
respectively. If the serial clock is not used pins 43 and 42 can
be connected to VCC.
The phase/frequency detector allows a wider capture range
and faster lock time than that which can be achieved with a
phase discriminator alone. The discrimination of frequency
also eliminates harmonic locking. With this type of discriminator,
the PLL can be over-damped for good stability without
sacrificing lock time.
The regenerated parallel clock (PCK OUT) is available at pin
19. This output is a single ended pseudo-ECL output requiring
a pull down resistor. If regenerated parallel clock is not used
pin 19 can be connected to VCC.
The charge pump delivers a 'charge packet' to the loop filter
which is proportional to the system phase error. Internal
voltage clamps are used to constrain the loop filter voltage
between approximately 1.8 and 3.4 volts.
The VCO, constructed from a current-controlled multivibrator,
features operation in excess of 400 Mb/s and a wide pull range
(≈± 40% of centre frequency).
520 - 27 - 08
DRS0
4
GS9002 PIN DESCRIPTIONS
PIN NO.
SYMBOL
TYPE
DESCRIPTION
1
VEE
Power Supply: Most negative power supply connection.
2
VCC3
Power Supply: Most positive power supply connection for the PLL and scrambler.
3
SYNC DET.
4
VEE
Power Supply: Most negative power supply connection.
5
VCC1
Power Supply: Most positive power supply connection for the input data latches and serializer.
6
7-16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
O
TTL output level that detects the occurrence of all zero’s or all one’s at inputs PD2-PD9
and pulses LOW for three PCK-IN durations. Used to detect SMPTE 259M reserved words
(000-003 and 3FC-3FF) in TRS sync word. Parallel data bits PD0 and PD1 are set Low or
High when PD2 - PD9 are Low or High respectively.
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
SYNC DET.
DISABLE
I
TTL level input that disables the internal Sync Detector when HIGH. This allows the
GS9002 to serialize 8 or 10 bit non - SMPTE Standard parallel data.
PD0-PD9
I
TTL level inputs of the parallel data words. PD0 is the LSB and PD9 is the MSB.
PCK-IN
I
TTL level input of the Parallel Clock.
VEE
Power Supply: Most negative power supply connection.
PCK OUT
O
Pseudo-ECL output representing the re-clocked Parallel Clock and is derived from the
internal VCO. The VCO is divided by 10 in order to produce this output.
LOCK DET.
O
TTL level output which goes HIGH when the internal PLL is locked.
Power Supply: Most positive power supply connection for the PLL and scrambler.
VCC3
LOOP FILT.
I
VEE
Connection for the R-C loop filter components. The loop filter sets the PLL loop
parameters.
Power Supply: Most negative power supply connection.
NC
VEE
SSS
Power Supply: Most negative power supply connection.
I
Scrambler/Serializer Select. TTL level input that selects scrambled NZRI output when
logic LOW or direct serializer output when logic HIGH.
VEE
Power Supply: Most negative power supply connection.
VCC3
Power Supply: Most positive power supply connection for the PLL and scrambler.
CREG
I
VEE
Compensation RC network for internal voltage regulator that requires decoupling with a series
0.1µF capacitor and 820Ω resistor. Components should be located as close as possible to the pin.
Power Supply: Most negative power supply connection.
RVCO3
I
VCO Resistor 3: Analog current input used to set the centre frequency of the VCO when
the two Data Rate Select bits (pins 35 and 36) are both set to logic 1. A resistor is
connected from this pin to VEE.
RVCO2
I
VCO Resistor 2: Analog current input used to set the centre frequency of the VCO when
the Data Rate Select Bit 0 (pin 36) is set to logic 0 and the Data Rate Select Bit 1 (pin 35)
is set to logic 1. A resistor is connected from this pin to VEE.
33
RVCO1
I
VCO Resistor 1: Analog current input used to set the centre frequency of the VCO when
the Data Rate Select Bit 0 (pin 36) is set to logic 1 and the Data Rate Select Bit 1 (pin 35)
is set to logic 0. A resistor is connected from this pin to VEE.
34
RVCO0
I
VCO Resistor 0: Analog current input used to set the centre frequency of the VCO when
the two Data Rate Select bits (pins 35 and 36) are both set to logic 0. A resistor is
connected from this pin to VEE.
35,36
DRS0, 1
I
TTL level inputs to the internal 2:4 demultiplexer used to select one of four VCO frequency
setting resistors (RVCO0 - RVCO3). (See above)
32
5
520 - 27 - 08
GS9002 PIN DESCRIPTIONS
PIN NO
SYMBOL
TYPE
DESCRIPTION
37
VEE
Power Supply: Most negative power supply connection.
38,39
SDO/SDO
40
VCC2b
Power Supply: Most positive power supply connection for the Serial Data ECL output buffers.
41
VCC2a
Power Supply: Most positive power supply connection for the Serial Clock ECL output buffers.
42,43
SCK/SCK
O
O
Serial Data Outputs (true and inverse). Pseudo-ECL differential outputs representing the serialized
data. These outputs require 390Ω pull down resistors.
Serial Clock Outputs (inverse and true). Pseudo-ECL differential outputs of the Serial Clock (10x
Parallel Clock). These outputs require 390Ω pull-down resistors.
44
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
VEE
Power Supply: Most negative power supply connection.
INPUT / OUTPUT CIRCUITS
VCC
VCC
5k
1k
1k
INPUT
SYNC DET
VR1
VEE
VEE
Fig. 2 Pin No. 3
Sync Detect
Fig. 3 Pins No. 6, 7 - 16, 17,26
Sync Disable, Parallel Data, Parallel Clock,
Scrambler/Serializer Select
VCC
VCC
VCC
1k
1k
10k
PCK OUT
LOCK
DETECT
VEE
VEE
Fig. 5 Pin No. 20
Lock Detect
Fig. 4 Pin No. 19
Parallel Clock Out
520 - 27 - 08
6
VCC
IVCO
VCC
VR2=2.15V
VSELECT
DRS0
800
DRS1
RVCOX
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
VR1
VEE
VEE
Fig. 7 Pins No. 31 - 34
Frequency Setting Registors RVCO0-RVCO3
Fig. 6 Pins No. 35, 36
Data Rate Select
VCC
200
200
SERIAL OUT
(TRUE)
SERIAL OUT
(INVERT)
VEE
Fig. 8 Pins No. 38, 39, 42, 43
Serial Outputs (Data & Clock)
tCLKL = tCLKH
50%
PARALLEL
CLOCK
PLCK
PARALLEL
DATA
PDn
SERIAL
DATA OUT
(SD0)
SERIAL
CLOCK OUT
(SCK)
tSU
tD
tD
50%
50%
tHOLD
Fig. 9 Waveforms
7
520 - 27 - 08
4ƒsc
DATA
STREAM
T
R
S
T
R
S
ACTIVE VIDEO
& H BLANKING
T
R
S
ACTIVE VIDEO
& H BLANKING
SYNC
DETECT
4:2:2
DATA
STREAM
E
A
V
H
BLNK
S
A
V
E
A
V
ACTIVE
VIDEO
H
BLNK
S
A
V
SYNC
DETECT
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
PCLK IN
PDN
XXX 3FF
000
000
XXX
•••
•••
XXX
3FF
000
000
XXX
•••
SYNC
DETECT
Fig. 10 Timing Diagram
+5V
LOOP
LOCKED
L.E.D.
+10
2N4400
0.1
330
82
10k
+5V
20
7
DATA 0
DATA 1
8
DATA 2
9
DATA 4
DATA 5
DATA 6
DATA 7
DATA 9
SSS
6
2,5,21,28,40,41
SYNC (6x VCC)
DIS.
100
10k
10k
100
100
100
38
PDI
DATA
SDO
PD2
39
DATA
SDO
43
CLOCK
SCK
GS9002
SCK
42
CLOCK
+5V
1M
17 PCK IN
36 DRS0
*150
*10p
DATA RATE
SELECT DIP
SWITCH
(SEE TRUTH TABLE,
FIG. 2)
LOCK
DET.
26
15 PD8
16 PD9
DATA 8
CLOCK
PD0
10 PD3
11
PD4
12
PD5
13
PD6
14 PD7
DATA 3
6x100n
5k
19
PCK-OUT
35 DRS1
22
LOOP FILT
29
CREG
RVCO1 RVCO2 RVCO3 RVCO4 VEE
34
33
32
31
1,4
18,23
0.1
25,27
30,37
1
2
3 4
44
820
4x0.1
PARALLEL
CLOCK OUT
0.1
3.9k
1k
COMMON
+5V
NOTES: Resistors 1, 2, 3 and 4 are used to set the VCO centre frequency. For 143/177 Mb/s ≈ 6kΩ, 270 Mb/s ≈ 2.7kΩ, 360 Mb/s ≈ 1.8kΩ
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
represent test points.
* This RC network is used to slow down fast PCLK risetimes ( ≤ 500ps).
It is not required if risetimes exceed 500ps.
Fig. 11 GS9002 Test Circuit
520 - 27 - 08
8
(VS = 5V, TA = 25° C unless otherwise shown)
600
600
550
550
500
500
450
450
FREQUENCY (MHz)
VCO FREQUENCY (MHz)
TYPICAL PERFORMANCE CURVES
400
350
300
V
LOOP
=2.6V
250
OPTIMAL
LOOP FILTER
VOLTAGE
RVCO = 1.8k
400
350
300
RVCO = 2.7k
250
200
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
200
150
150
RVCO = 6.3k
100
100
50
50
0
0
1
2
3
4
5
6
7
8
9
10
1.8
2.0
FREQUENCY SETTING RESISTANCE (kΩ)
2.2
2.4
2.6
2.8
3.0
3.2
3.4
LOOP FILTER VOLTAGE (V)
Fig. 12 VCO Frequency
Fig. 13 VCO Frequency vs Loop Filter Voltage
1000
200
V = 5.25V
V = 5.25V
S
950
S
900
V = 5.0V
CURRENT (mA)
SERIAL OUTPUT (mV)
190
S
850
800
V = 4.75V
S
750
V = 5.0V
S
180
170
V = 4.75V
S
160
700
0
10
20
30
40
50
60
150
70
0
10
20
30
40
50
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
Fig. 14 Serial Output Level (Data & Clock)
Fig. 15 Supply Current
60
70
800
700
JITTER p-p (ps)
600
500
143 Mb/s
400
270 Mb/s
300
200
100
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
LOOP FILTER VOLTAGE (V)
Fig. 16 Output Jitter
9
520 - 27 - 08
520 - 27 - 08
10
10k
14
15
16
17 PCK IN
36 DRS0
100
100
100
100
+5V
13
100
10k
12
6
PCK-OUT
SCK
SCK
SDO
SDO
4x0.1
820
1
2
3
4
25,27
30,37
44
22
19
42
43
39
38
3.9k
0.1
390
2,5,21,28,40,41
SYNC (6x VCC)
DIS.
GS9002
SSS
26
6x100n
10
35 DRS1
LOOP FILT
29
CREG
RVCO0 RVCO1 RVCO2 RVCO3 VEE
34
33
32
31 1,4
0.1
18,23
PD9
PD8
PD7
PD6
PD5
11
PD4
20
5k
LOCK
DET.
100
PD3
PD2
PDI
PD0
100
10pF
9
100
10
8
100
100
7
*100
10k
2N4400
+
1k
180
100
1M
+5V
390
0.1
47
47
100
100
18p
6
7
0.1µ
27
SER . IN
SER. IN
Fig. 17 GENLINX ™ Serial Digital Chipset
GS9002/7 Application Circuit
NOTES: Resistors 1, 2, 3 and 4 are used to set the VCO centre frequency. See Figures 12 and 13.
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
represent test points.
* These resistors are used to slow down fast INPUT edges ( ≤500ps ) and prevent the input signals from ringing below the VEE rail.
DATA RATE
SELECT DIP
SWITCH
(SEE TRUTH TABLE)
CLOCK
DATA 9
DATA 8
DATA 7
DATA 6
DATA 5
DATA 4
DATA 3
DATA 2
DATA 1
DATA 0
+5V
330
LOOP
LOCKED
L.E.D.
1
0
1
0
1
1
3
2
1
0
RVCO NO.
4x150
OUT 2 4
DATA RATE SELECT
TRUTH TABLE
0
DRS0
0
DRS1
0.1
2
1
OUT 2 3
OUT 1
OUT 1
PARALLEL CLOCK T.P.
5
VEE
CABLE
DRIVER
GS9007
VCC
8
+
10
68
1.0
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
1.0
68
68
1.0
1.0
68
1p8
1p8
This signal is 12dB
below actual SCK
level and is used for
test purposes
1p8
SERIAL
CLOCK
(50Ω)
SDO2
(75Ω)
SDO2
(75Ω)
1p8
SDO1
(75Ω)
SDO1
(75Ω)
+5V
APPLICATION CIRCUIT
Figure 17 shows a typical application circuit of the GS9002
driving a GS9007 cable driver.
An applications board is fully described in Application Note
520-83, entitled 'Serial Digital Encoder Board Using the
GS9002 and GS9009'. The board and application note are
available from Gennum Corporation.
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
DOCUMENT
IDENTIFICATION
PRODUCT PROPOSAL
This data has been compiled for market investigation purposes
only, and does not constitute an offer for sale.
ADVANCE INFORMATION NOTE
This product is in development phase and specifications are
subject to change without notice. Gennum reserves the right to
remove the product at any time. Listing the product does not
constitute an offer for sale.
REVISION NOTES
Watermark added.
For latest product information, visit www.gennum.com
PRELIMINARY
The product is in a preproduction phase and specifications are
subject to change without notice.
CAUTION
ELECTROSTATIC
DATA SHEET
The product is in production. Gennum reserves the right to
make changes at any time to improve reliability, function or
design, in order to provide the best product possible.
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
© Copyright March 1991 Gennum Corporation. All rights reserved. Printed in Canada.
11
520 - 27 - 08
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