DS125BR800A Datasheet, PDF (7/53 Pages) Texas Instruments – Low-Power 12.5-Gbps 8-Channel (Unidirectional) Repeater With Input Equalization

DS125BR800A
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Electrical Characteristics^(1)(2)(3) (continued)
Symbol
Parameter
Test Conditions
V_il
Low Level Input Voltage
V_oh
High Level Output Voltage
I_oh= −4mA
(ALL_DONE pin)
V_ol
Low Level Output Voltage
I_ol= 4mA
(ALL_DONE pin)
I_ih
Input High Current (PWDN pin)
VIN = 3.6 V (pin 24),
Input High Current with internal
Input under test = 3.6 V
resistors
(4–level input pin)
I_il
Input Low Current (PWDN pin)
VIN = 3.6 V (pin 24),
Input Low Current with internal
Input under test = 0 V
resistors
(4–level input pin)
CML Receiver Inputs (IN_n+, IN_n-)
RL_rx-diff
RX Differential return loss
0.05 - 7.5 GHz
7.5 - 15 GHz
RL_rx-cm
Z_rx-dc
Z_rx-diff-dc
V_rx-diff-dc
RX Common mode return loss
RX DC common mode impedance
RX DC differntial mode impedance
Differential RX peak to peak voltage
(VID)
0.05 - 5 GHz
Tested at VDD = 2.5 V
Tested at VDD = 2.5 V
Tested at pins
V_{rx-signal-det-diff-pp} Signal detect assert level for active
data signal
SD_TH = float,
0101 pattern at 12 Gbps
V_{rx-idle-det-diff-pp}
Signal detect de-assert level for
electrical idle
SD_TH = float,
0101 pattern at 12 Gbps
High Speed Outputs
V_tx-diff-pp
Output Voltage Differential Swing
Differential measurement with
OUT_n+ and OUT_n-,
terminated by 50Ω to GND,
AC-Coupled, VID = 1.0 Vp-p,
DEM0 = 1, DEM1 = 0⁽⁴⁾
V_{tx-de-ratio_3.5}
TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEM0 = 0, DEM1 = R,
Gen 1 and 2 modes only
V_{tx-de-ratio_6}
TX de-emphasis ratio
VOD = 1.0 Vp-p,
DEM0 = R, DEM1 = R
Gen1 and 2 modes only
T_TX-HF-DJ-DD
T_TX-LF-RMS
T_TX-RISE-FALL
TX Dj > 1.5 MHz
TX RMS jitter < 1.5 MHz
TX rise/fall time
20% to 80% of differential output
voltage
T_RF-MISMATCH
TX rise/fall mismatch
20% to 80% of differential output
voltage
RL_TX-DIFF
TX Differential return loss
0.05 - 7.5 GHz
7.5 - 15 GHz
RL_TX-CM
Z_TX-DIFF-DC
V_TX-CM-AC-PP
TX Common mode return loss
DC differential TX impedance
TX AC peak-peak common mode
voltage
0.05 - 5 GHz
VOD = 1.0 Vp-p,
DEM0 = 1, DEM1 = 0
I_TX-SHORT
TX short circuit current limit
Total current the transmitter can
supply when shorted to VDD or
GND
Min
0
2.0
-15
+20
-15
-160
40
80
0.6
0.8
35
SNLS467 – NOVEMBER 2013
Typ
Max
Unit
0.8
V
V
0.4
V
+15
uA
+150
uA
+15
uA
-40
uA
-15
dB
-5
dB
-10
dB
50
60
Ω
100
120
Ω
1.0
1.2
V
50
mVp-p
37
mVp-p
1.0
1.2
Vp-p
-3.5
dB
-6
dB
0.15
UI
3.0
ps RMS
45
ps
0.01
0.1
UI
-15
dB
-5
dB
-10
dB
100
Ω
100
mVpp
20
mA
(4) In SAS3 and GEN3 mode the output VOD level is not fixed. It will be adjusted automatically based on the VID input amplitude level. The
output VOD level set by DEMA/B[1:0] is dependent on the VID level and the frequency content. The DS125BR800A repeater in SAS3
and GEN3 mode is designed to be transparent, so the TX-FIR (de-emphasis) is passed to the RX to support link training.
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