GS1515-CQM Gennum Corporation, GS1515-CQM Datasheet - Page 5

• Manufacturer Part Number: GS1515-CQM
• Description: Hd-linx(tm) HDTV Serial Digital Reclocker
• Manufacturer: Gennum Corporation

PIN DESCRIPTIONS
PIN DESCRIPTIONS
PIN DESCRIPTIONS
PIN DESCRIPTIONS
1, 3, 4, 6, 7, 9, 10,
24, 25, 27, 29, 31,
33, 34, 36, 38
2
5
8
11
12
13, 14
15, 18, 22
16, 17
19
20, 21
23
26
28
30
32
35, 37
39, 40
41
42
43
44
NUMBER
PLL_LOCK
VCO, VCO
SDO, SDO
SYMBOL
DDI, DDI
LFA_V
LFA_V
DFT_V
DM, DM
BYPASS
SHIELD
DDI_V
CD_V
PD_V
CD_V
PLCAP,
PD_V
PLCAP
R
LFS
LFA
LFS
NC
IJI
SET
CC
EE
CC
CC
EE
EE
EE
TT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
POWER
POWER
POWER
POWER
POWER
POWER
POWER
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
INPUT
TYPE
No connection. These pins are not bonded to the die.
Loop filter capacitor connection.
Most negative power supply connection - loop filter circuitry.
Most positive power supply connection - loop filter circuitry.
Control signal output: control voltage for the external GO1515 VCO.
Most negative power supply connection - that enables the jitter demodulator
functionality, this pin should be connected to ground. If left floating, the DM
function is disabled resulting in a current saving of 340µA.
Control signal input: PLL lock detect time constant capacitor connection.
No connect pins separating the DDI inputs, the VCO inputs and the loop filter
components to improve noise performance. Connection to be made to ground
in most cases depending upon PCB performance.
Control signal inputs: differential inputs for the external VCO. The GO1515 has
single ended output. In this case, the VCO input is decoupled to ground.
Centre tap of the two 50 Ω on-chip termination resistors between the DDI and
the DDI inputs.
Differential inputs for the serial digital signals.
Most positive power supply connection - phase detector circuitry.
Most negative poser supply connection - phase detector circuitry.
Most negative power supply connection - cable driver circuitry.
Resistor used to set the serial digital output signal swing. It is connected
between here and ground with a very short trace length.
Most positive power supply connection - cable driver circuitry.
Differential serial digital outputs from the on-chip cable driver. These outputs
require 75 Ω pull-up resistors.
Diagnostic signal: if the jitter demodulator function is not used, these pins must
be left floating.
Status signal output: indicates the amount of excessive jitter on the incoming
DDI and DDI signals.
Status signal output: lock detect and carrier detect: PLL lock indicator output
used to indicate when the PLL is locked. This output is TTL compatible. When
the PLL_LOCK = LOW, the serial digital outputs are muted.
Control signal input: operational TTL compatible input that controls whether the
input DDI and DDI signal is reclocked (BYPASS = HIGH) or is passed through
the device, unreclocked (BYPASS = LOW). Muting does not affect the
bypassed signal.
Loop filter capacitor connection.
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DESCRIPTION
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