ICL7129 Datasheet, PDF (1/11 Pages) Intersil Corporation – 41/2 Digit LCD, Single-Chip A/D Converter

ICL7129
August 1997
4¹/₂ Digit LCD,
Single-Chip A/D Converter
Features
• ±19,999 Count A/D Converter Accurate to ±4 Count
• 10µV Resolution on 200mV Scale
• 110dB CMRR
• Direct LCD Display Drive
• True Differential Input and Reference
• Low Power Consumption
• Decimal Point Drive Outputs
• Overrange and Underrange Outputs
• Low Battery Detection and Indication
• 10:1 Range Change Input
Ordering Information
TEMP.
PART NUMBER RANGE (^oC) PACKAGE
ICL7129CPL
0 to 70 40 Ld PDIP
ICL7129RCPL
0 to 70 40 Ld PDIP
ICL7129CM44
0 to 70 44 Ld MQFP
NOTE: “R” indicates device with reversed leads.
PKG. NO.
E40.6
E40.6
Q44.10x10
Description
The Intersil ICL7129 is a very high performance 4¹/₂-digit,
analog-to-digital converter that directly drives a multiplexed
liquid crystal display. This single chip CMOS integrated cir-
cuit requires only a few passive components and a reference
to operate. It is ideal for high resolution hand-held digital
multimeter applications.
The performance of the ICL7129 has not been equaled
before in a single chip A/D converter. The successive integra-
tion technique used in the ICL7129 results in accuracy better
than 0.005% of full scale and resolution down to 10µV/count.
The ICL7129, drawing only 1mA from a 9V battery, is well
suited for battery powered instruments. Provision has been
made for the detection and indication of a “LOW/BATTERY”
condition. Autoranging instruments can be made with the
ICL7129 which provides overrange and underrange outputs
and 10:1 range changing input. The ICL7129 instantly checks
for continuity, giving both a visual indication and a logic level
output which can enable an external audible transducer. These
features and the high performance of the ICL7129 make it an
extremely versatile and accurate instrument-on-a-chip.
Pinouts
ICL7129 (PDIP)
TOP VIEW
OSC1 1
OSC3 2
ANNUNCIATOR
DRIVE
3
B₁, C₁, CONT 4
A₁, G₁, D₁ 5
F₁, E₁, DP₁ 6
B₂, C₂, LO BAT 7
A₂, G₂, D₂ 8
F₂, E₂, DP₂ 9
B₃, C₃, MINUS 10
A₃, G₃, D₃ 11
F₃, E₃, DP₃ 12
B₄, C₄, BC₅ 13
A₄, D₄, G₄ 14
F₄, E₄, DP₄ 15
BP3 16
BP2 17
BP1 18
V_DISP 19
DP₄/OR 20
40 OSC2
39 DP₁
38 DP₂
37 RANGE
36 DGND
35 REF LO
34 REF HI
33 IN HI
32 IN LO
31 BUFF
30 C_REF-
29 C_REF+
28 COMMON
27 CONTINUITY
26 INT OUT
25 INT IN
24 V+
23 V-
22 LATCH/HOLD
21 DP₃/UR
ICL7129 (MQFP)
TOP VIEW
DGND
RANGE
DP₂
DP₁
OSC 2
OSC 1
OSC 3
NC
NC
ANNUNCE
DRIVE
B₁, C₁, CONT
144 ^{43 42 41 40}
39
38
37 36
35 34
33
2
32
3
31
4
30
5
29
6
28
7
27
8
26
9
25
10
24
11
23
12 13 14 15 16 17 18 19 20 21 22
V+
V-
NC
NC
LATCH/
HOLD
DP₃/UR
DP₄/OR
V_DISP
BP1
BP2
BP3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
3-31
File Number 3085.1