HT7135A
HT7135A is 4 1/2-DIGIT PRECISION ANALOG-TO-DIGITAL CONVERTERS manufactured by HTCSEMI.
description
The HT7135A and TLC7135A converters are manufactured with Htcsemi Instruments highly efficient CMOS technology. These 4 1/2-digit, dual-slope-integrating, analog-to-digital converters (DACs) are designed to provide interfaces to both a microprocessor and a visual display. The digit-drive outputs D1 through D4 and multiplexed binary-coded-decimal outputs B1, B2, B4, and B8 provide an interface for LED or LCD decoder/drivers as well as microprocessors.
The HT7135A and TLC7135A offer 50-ppm (one part in 20,000) resolution with a maximum linearity error of one count. The zero error is less than 10 µV and zero drift is less than 0.5 µV/°C. Source-impedance errors are minimized by low input current (less than 10 p A). Rollover error is limited to ± 1 count.
The BUSY, STROBE, RUN/HOLD, OVER RANGE, and UNDER RANGE control signals support microprocessor-based measurement systems. The control signals also can support remote data acquisition systems with data transfer through universal asynchronous receiver transmitters (UARTs).
The HT7135A and TLC7135A are characterized for operation from 0°C to 70°C.
TA 0°C to 70°C
AVAILABLE OPTIONS
PACKAGE
PLASTIC DIP (N)
SMALL OUTLINE (DW)
HT7135ANZ
HT7135ARWZ
TLC7135ANZ
TLC7135ARTZ
Rev. 00 functional block diagram
23 POLARITY From Analog
Section
22 CLK
25 RUN/HOLD 27 OVER RANGE
28 UNDER RANGE
26 STROBE
21 BUSY
24 DGTL GND
Polarity Flip-Flop
Zero Cross Detect
Control Logic
DIGITAL SECTION Latch
Counters
Latch Latch
Latch
Latch
HT7135A TLC7135A
20 D1 (LSD)
19 D2
18 D3
17 D4 12 D5 (MSD)
Digit Drive Output
Multiplexer 13 B1 (LSB) 14 B2 15 B4 16 B8 (MSB)
Binary Coded Decimal Output
A/Z 2...
