Instruction Manual

10 _____________________________________________________________________________________
DS1876
SFP Controller with Dual LDD Interface
Pin Configuration
Pin Description
THIN QFN
(5mm
× 5mm × 0.8mm)
TOP VIEW
26
27
25
24
10
9
11
SCL
TXFOUT
TXF1
IN1
TXD1
12
RSELOUT
MOD1 GND TXDOUT2 GND V
CC
N.C.
1 2
APC1
4 5 6 7
2021 19 17 16 15
V
CC
TXF2
BMON2
PMON2
TXDOUT1
RSEL
SDA
MOD2
3
18
28
8
OUT1
GND
APC2
23
13
PMON1
TXD2
22
14
BMON1
REFIN
DS1876
*EP
+
*EXPOSED PAD.
PIN NAME FUNCTION
1 RSELOUT Rate-Select Output
2 SCL I
2
C Serial-Clock Input
3 SDA I
2
C Serial-Data Input/Output
4 TXFOUT
Transmit Fault Output, Open
Drain
5 TXF1 Transmit Fault Input 1
6 IN1
Digital Input. General-purpose
input, AS1 in SFF-8079, or RS1
in SFF-8431.
7 TXD1 Transmit Disable Input 1
8, 18, 21 GND Ground Connection
9 RSEL Rate-Select Input
10 TXDOUT1 Transmit Disable Output 1
11 PMON2
External Monitor Input PMON2
and HTXP2/LTXP2 Quick Trip
12 BMON2
External Monitor Input BMON2
and HBATH2 Quick Trip
13 PMON1
External Monitor Input PMON1
and HTXP1/LTXP1 Quick Trip
PIN NAME FUNCTION
14 BMON1
External Monitor Input BMON1
and HBATH1 Quick Trip
15 N.C. No Connection
16, 26 V
CC
Power-Supply Input
17 TXDOUT2 Transmit Disable Output 2
19 MOD2 MOD2 DAC, Delta-Sigma Output
20 MOD1 MOD1 DAC, Delta-Sigma Output
22 REFIN
Reference Input for DAC1 and
DAC2
23 TXD2 Transmit Disable Input 2
24 APC2 APC2 DAC, Delta-Sigma Output
25 APC1 APC1 DAC, Delta-Sigma Output
27 TXF2 Transmit Fault Input 2
28 OUT1
Digital Output. General-purpose
output, AS1 output in SFF-8079,
or RS1 output in SFF-8431.
— EP Exposed Pad (Connect to GND)