DS125BR820 Datasheet, PDF (9/62 Pages) Texas Instruments – Low-Power 12.5 Gbps 8-Channel Linear Repeater

www.ti.com
DS125BR820
SNLS491B – JULY 2014 – REVISED FEBRUARY 2015
Electrical Characteristics (continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
HIGH SPEED OUTPUTS
RL_Tx-DIFF
Tx Differential return loss
SDD22 10 MHz - 2 GHz
SDD22 5.5 GHz
SDD22 11.1 GHz
-15
dB
-12
-10
dB
RL_Tx-CM
Z_Tx-DIFF-DC
I_Tx-SHORT
Tx Common mode return loss
DC differential Tx impedance
Transmitter short circuit current limit
SCC22 50 MHz- 2.5 GHz
Total current when output is
shorted to VDD or GND
-8
dB
100
Ω
20
mA
V_{Tx-CM-DC-LINE-}
DELTA
V_Tx-DIFF1-PP
Absolute delta of DC common mode
voltage between Tx+ and Tx-
Output Voltage Differential Swing
Differential measurement with
OUT_n+ and OUT_n-,
AC-Coupled and terminated by
50 Ω to GND,
Inputs AC-Coupled,
Measured with 8T Pattern at 12
Gbps ⁽¹⁾
VID = 600 mVp-p
VOD = Level 6⁽²⁾⁽³⁾
25 mV
615
mVp-p
V_Tx-DIFF2-PP
Output Voltage Differential Swing
Differential measurement with
OUT_n+ and OUT_n-,
AC-Coupled and terminated by
50 Ω to GND,
Inputs AC-Coupled,
Measured with 8T Pattern at 12
Gbps ⁽¹⁾
VID = 1000 mVp-p
VOD = Level 6⁽²⁾⁽³⁾
950
mVp-p
V_Tx-DIFF3-PP
Output Voltage Differential Swing
Differential measurement with
OUT_n+ and OUT_n-,
AC-Coupled and terminated by
50 Ω to GND,
Inputs AC-Coupled,
Measured with 8T Pattern at 12
Gbps ⁽¹⁾
VID = 1200 mVp-p
VOD = Level 6⁽²⁾⁽³⁾
1100
mVp-p
T_PDEQ
V_Tx-CM-AC-P
V_DISABLE-OUT
V_OOB-IDLE
V_OOB-OS-DELTA
Differential propagation delay
AC common mode voltage
Tx disable output voltage
OOB idle output voltage
OOB offset delta
EQ = Level 1 to Level 4
VOD = Level 6, 12 Gbps
Driver disabled via PWDN
VID = 0 mVp-p
OOB pattern, EQ = Level 1
VOD = Level 6
80
ps
20
mV rms
-30
1
30 mVp-p
15
mVp-p
15
mVp-p
V_OOB-CM-DELTA
OOB common mode delta
OOB pattern, EQ = Level 1
VOD = Level 6
11
mVp-p
T_{Tx-IDLE-SET-TO-}
IDLE
T_{Tx-IDLE-TO-DIFF-}
DATA
Time to transition to idle after
differential signal
Time to transition to valid differential
signal after idle
VID = 1.0 Vp-p, 1.5 Gbps
VID = 1.0 Vp-p, 1.5 Gbps
0.70
ns
0.04
ns
(1) 8T pattern is defined as a 1111111100000000'b pattern bit sequence.
(2) ATE measurements for production are tested at DC.
(3) In 40G-CR4/KR4/SAS/SATA/PCIe applications, the output VOD level is not fixed. It adjusts automatically based on the VID input
amplitude level. The output VOD level set by VODA/B[1:0] depends on the VID level and the frequency content. The DS125BR820
repeater is designed to be transparent in this mode, so the Tx-FIR (de-emphasis) is passed to the Rx to support the handshake
negotiation link training.
Copyright © 2014–2015, Texas Instruments Incorporated
Submit Documentation Feedback
9