THS0842
DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER
WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
SLAS246 – DECEMBER 1999
PFB PACKAGE
(TOP VIEW)
features
Dual Simultaneous Sample and Hold Inputs
Differential or Single-Ended Analog Inputs
8-Bit Resolution 40 MSPS Sampling
Analog-to-Digital Converter (ADC)
Single or Dual Parallel Bus Output
36 35 34 33 32 31 30 29 28 27 26 25
Low Power Consumption: 275 mW Typ
Using External References
24
23
22
21
20
19
18
17
16
15
14
13
DRV
DA0
DA1
DA2
DA3
DA4
DA5
DA6
DA7
NC
AV
37
38
39
40
41
42
43
SS
DD
I+
Wide Analog Input Bandwidth: 600 MHz Typ
3.3 V Single-Supply Operation
I–
AV
AV
STBY
DV
SS
3.3 V TTL/CMOS-Compatible Digital I/O
DD
Internal or External Bottom and Top
Reference Voltages
SS
SELB 44
Adjustable Reference Input Range
Power-Down (Standby) Mode
DV
AV
45
46
DD
SS
48-Pin Thin Quad Flat Pack (TQFP)
Package
NC
DRV
CLK 47
OE 48
DD
1
2
3
4
5
6
7
8
9 10 11 12
applications
Digital Communications (Baseband
Sampling)
Cable Modems
Set Top Boxes
Test Instruments
description
The THS0842 is a dual 8-bit 40 MSPS high-speed A/D converter. It alternately converts each analog input signal
into 8-bit binary-coded digital words up to a maximum sampling rate of 40 MSPS with an 80 MHz clock. All digital
inputs and outputs are 3.3 V TTL/CMOS-compatible.
Thanks to an innovative single-pipeline architecture implemented in a CMOS process and the 3.3 V supply, the
device consumes very little power. In order to provide maximum flexibility, both bottom and top voltage
references can be set from user supplied voltages. Alternately, if no external references are available, on-chip
references can be used which are also made available externally. The full-scale range is 1 Vpp, depending on
the analog supply voltage. If external references are available, the internal references can be powered down
independently from the rest of the chip, resulting in an even greater power saving.
The device is specifically suited for the baseband sampling of wireless local loop (WLL) communication, cable
modems, set top boxes (STBs), and test instruments.
AVAILABLE OPTIONS
PACKAGED DEVICES
T
A
TQFP-48
–40°C to 85°C
THS0842IPFB
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265