HDMP-1685A Datasheet, PDF (13/21 Pages) Agilent(Hewlett-Packard) – 1.25 Gbps Four Channel SerDes with 5-pin DDR SSTL-2 Parallel Interface

V_CC (SERDES) = 3.3 V V_CC (SERDES) = 3.3 V
V_CC
VREFR
R₁
0.1 µF
R₂
V_CC (MAC)
V_DDQ (MAC)
V_CC
VDDQ
VREFT
RX[0:3][0:4]
RC[0:3][0:1]
RS = 50 Ω
UNTERMINATED
DATAIN
TX[0:3][0:4]
TC
RS = 50 Ω
USE TERMINATION, IF NECESSARY, TO
DELIVER PROPER VOLTAGE SWINGS AT TX[0:4]
V_DDQ (MAC)
DATAOUT
VREFT
HDMP-1685
R₁
0.1 µF
R₂
MAC
NOTE: VREFR ON EACH DEVICE MAY BE USED TO DRIVE VREFT ON THE OTHER DEVICE INSTEAD OF USING
THE CONFIGURATION ABOVE. VREFR SHOULD BE BYPASSED WITH 0.1 µF IN THIS CASE. IF USED, R₁ AND R₂
SHOULD BE 500-1000 Ω. 1% RESISTORS SHOULD BE USED FOR R₁ AND R₂. WHEN USING THE CONFIGURATION
ABOVE, VREFT TO THE MAC SHOULD BE SET TO 1.25 V NOMINAL. USING THIS VALUE CENTERS VREFR RELATIVE
TO THE RX[0:3][0:4] OUTPUT SWINGS PROVIDED BY THE HDMP-1685A.
Figure 11. O-SSTL_2 and I-SSTL_2 simplified circuit schematic.
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17
A GND V_CC GND SYN1 RC10 RX10 RX14
B
GND RC11 RX11 VCR1
VCR1 V_CC GND RX21 VCR2
GND SYN2 RX20 RX22
GND VCR2 GND
SYN3 RC30 RC31
C RX04
VCR0 VCR1 RX12 GND
D RX00 RX01 VCR0 GND GND RX13 VRFR
RC20 VCR2 RX23
RC21 GND RX24
V_CC VCR3 GND RX30
RX31 RX32 RX33 RX34
E RC00 RC01 RX02 RX03
VCR3 GND
F
SYN0 VCR0 GND
GND
G
GND V_CC
GND
TX22 TX21 TX20 VCR3
H TX14
GNDA
TX24 TX23
J TX10 TX11 TX12 TX13
V_CCP
V_CC
K
L
M TX04
GND GND
GND V_CC
V_CC
V_CCA
VCR
GND GND V_CC TC
TX33 TX32 TX31 TX30
TX34
N _{TX00 TX01 TX02 TX03}
PLUP V_CC
P VRFT
GND SO0— GND SO1— GND CAP0 GND SO2+ GND SO3+
R RFCT
GND V_CC SO0+ GND SO1+ GNDA CAP1 GND SO2— GND SO3— V_CC GND V_CC SYNC
T
GND V_CC V_CC VCP0 GND VCP1 GND V_CCA GND VCP2 GND VCP3 V_CC GND GND
U GND GND SIO— SI0+ V_CC SI1— SI1+ GND GND SI2— SI2+ GND SI3— SI3+ GND GND GND
Figure 12. Pinout of HDMP-1685A (top view).
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