
P
PRELIMINARY INFORMATION
describes products that are not in full production at the time of printing. Specifications are based on design goals
and limited characterization. They may change without notice. Contact Fairchild for current information.
www.fairchildsemi.com
Features
8-bit resolution
20 Msps conversion rate
Low power: 15mW @ 5 Msps
Integral track/hold
Integral and differential linearity error 0.5 LSB
Single +3V power supply
Three-state TTL/CMOS-compatible outputs
Low cost
Applications
Video digitizing
VGA and CCD digitizing
LCD projection panels
Image scanners
Personal computer video boards
Multimedia systems
Low cost, high speed data conversion
Description
The TMC1173A/1273 analog-to-digital (A/D) converter
employs a two-step architecture to convert analog signals
into 8-bit digital words at sample rates of up to 20 Msps
(Megasamples per second). An integral Track/Hold circuit
delivers excellent performance on signals with full-scale fre-
quency components up to 5 MHz. The innovative architec-
ture and submicron CMOS technology limit typical power
dissipation to 15 mW.
The TMC1173A/1273 operates from a single +2.7 to +3.6
Volt power supply and has internal voltage reference resis-
tors for self-bias operation. Input capacitance is very low,
simplifying or eliminating input driving amplifiers. All digi-
tal three-state outputs are 3V TTL- and CMOS-compatible.
The TMC1173A and TMC1273 share their core architec-
tures; the TMC1273 adds two overrange outputs that indicate
when the analog input signal is beyond the conversion range.
The TMC1173A/1273 is available in 24-pin plastic DIP,
24-lead plastic SOIC, and 28-lead J-lead PLCC packages.
Performance specifications are guaranteed from -20
°
C to
75
°
C.
Block Diagram
Reference
Matrix
D
7-0
V
IN
VR+
R
T
R
B
VR–
Track/
Hold
OE
ORN*
ORP*
CONV
65-1173A-01
Coarse
Quantizer
Digital
Error-
Corrector
Fine
Quantizer
*TMC1273 Only
T MC1173A/T MC1273
Video A/D Converter
8 bit, 20 Msps, 3V
Rev. 0.9.0