DS1843_12 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Fast Sample-and-Hold Circuit

19-4539; Rev 1; 2/12
Fast Sample-and-Hold Circuit
General Description
The DS1843 is a sample-and-hold circuit useful for cap-
turing fast signals where board space is constrained. It
includes a differential, high-speed switched capacitor
input sample stage, offset nulling circuitry, and an out-
put buffer. The DS1843 is optimized for use in optical
line transmission (OLT) systems for burst-mode RSSI
measurement in conjunction with an external sense
resistor.
Applications
Gigabit Passive Optical Network (GPON) OLT
Gigabit Ethernet Passive Optical Network (GEPON) OLT
GPON Optical Network Unit
Sample and Hold
Features
o Fast Sample Time < 300ns
o Hold Time > 100µs
o Low Input Offset
o Buffered Output
o Small, 8-Pin µDFN (2mm x 2mm) Pb-Free Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1843D+
-40°C to +85°C
8 µDFN
DS1843D+TRL
-40°C to +85°C
8 µDFN
+Denotes a lead(Pb)-free/RoHS-compliant package.
TRL = Tape and reel.
Typical Operating Circuit
DS1842/
MAX4007
3.3V
V_CC
V_INP
C_IN
R_IN
C_IN
V_INN
DS1843
C_S
C_S
STROBE
SEN
GND
CONTROL
LOGIC
SDA
I²C
SCL _INTERFACE
V_CC
V_OUTP
V_OUTN
MON1
BMD
MON3P
MON3N
MON4
TEMP
3.3V
SENSOR
DEN _STROBE ^SEN
MAIN MEMORY
EEPROM/SRAM
A/D CONFIG/RESULTS,
SYSTEM STATUS BITS,
ALARMS/WARNINGS,
LOOKUP TABLES,
USER MEMORY
MOD
12-BIT
DAC
ADC
BIAS
DAC
CONTROLLER
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.