A/D Convertidor 3-Digitos

CA3162, CA3162A
August 1997

A/D Converters for 3-Digit Display
Description
The CA3162E and CA3162AE are I2L monolithic A/D converters that provide a 3 digit multiplexed BCD output. They are used with the CA3161E BCD-to-Seven-Segment Decoder/Driver and a minimum of external parts to implement a complete 3-digit display. The CA3162AE is identical to the CA3162E except for an extendedoperating temperature range. The CA3161E is described in the Display Drivers section of this data book.

Features
• Dual Slope A/D Conversion • Multiplexed BCD Display • Ultra Stable Internal Band Gap Voltage Reference • Capable of Reading 99mV Below Ground with Single Supply • Differential Input • Internal Timing - No External Clock Required • Choice of Low Speed (4Hz) or High Speed (96Hz) ConversionRate • “Hold” Inhibits Conversion but Maintains Delay • Overrange Indication - “EEE” for Reading Greater than +999mV, “-” for Reading More Negative than -99mV When Used With CA3161E • Extended Temperature Range Version Available

Ordering Information
PART NUMBER CA3162E CA3162AE TEMP. RANGE (oC) 0 to 70 -40 to 85 PACKAGE 16 Ld PDIP 16 Ld PDIP PKG. NO. E16.3 E16.3

Pinout
CA3162 (PDIP) TOPVIEW

BCD OUTPUTS

21 20 NSD

1 2 3 4 5 6 7 8

16 23 15 22 14 V+

BCD OUTPUTS

DIGIT SELECT OUTPUTS

MSD LSD

13 GAIN ADJ 12 INTEGRATING CAP

HOLD/ BYPASS GND ZERO ADJ

11 HIGH INPUT 10 LOW INPUT 9 ZERO ADJ

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation1999

File Number

1080.2

3-5

CA3162, CA3162A Functional Block Diagram

V+ ZERO ADJ 8 9

V+ BCD OUTPUTS INTEGRATING CAP 12 21 1 20 2 22 15 23 16 V+ 14

3 CONTROL LOGIC COUNTERS AND MULTIPLEX DIGIT DRIVE 4 5 4 THRESHOLD DET. 5 = MSD = LSD = NSD DIGIT SELECT OUTPUTS †

HIGH INPUT 11 LOW INPUT 10

V/I CONVERTER

÷2048

÷96

3

REFERENCE CURRENT GENERATOR

BAND GAPREFERENCE

OSC

HOLD/ BYPASS GATES

6

CONVERSION CONTROL

13

7

GND

†

MSD = MOST SIGNIFICANT DIGIT NSD = NEXT SIGNIFICANT DIGIT LSD = LEAST SIGNIFICANT DIGIT

GAIN ADJ

3-6

CA3162, CA3162A
Absolute Maximum Ratings
DC Supply Voltage (Between Pins 7 and 14) . . . . . . . . . . . . . . . +7V Input Voltage (Pin 10 or 11 to Ground). . . . . . . . . . . . . . . . . . . ±15VThermal Information
Thermal Resistance (Typical, Note 1) θJA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC

Operating Conditions
TemperatureRange CA3162E. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 75oC CA3162AE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above thoseindicated in the operational sections of this specification is not implied.

NOTE: 1. θJA is measured with the component mounted on an evaluation PC board in free air.

Electrical Specifications
PARAMETER

TA = 25oC, V+ = 5V, Zero Pot Centered, Gain Pot = 2.4kΩ, Unless Otherwise Specified TEST CONDITIONS MIN 4.5 100kΩ to V+ on Pins 3, 4, 5 Pins 10 and 11 V11-V10 = 0V, Read Decoded Output V11-V10 =900mV, Read Decoded Output Notes 1 and 2 -12 846 -1 TYP 5 100 -80 MAX 5.5 17 +12 954 +1 UNITS V mA MΩ nA mV mV Count

Operating Supply Voltage Range, V+ Supply Current, I+ Input Impedance, ZI Input Bias Current, IIB Unadjusted Zero Offset Unadjusted Gain Linearity Conversion Rate Slow Mode Fast Mode Conversion Control Voltage (Hold Mode) at Pin 6 Common Mode Input Voltage Range, VICR BCD Sink...