NTE2055 Datasheet, PDF (1/4 Pages) NTE Electronics – Integrated Circuit CMOS, 3 1/2 Digit A/D Converter

NTE2055
Integrated Circuit
CMOS, 3 ¹/₂ Digit A/D Converter
Description:
The NTE2055 is a high performance, low power, 3 ¹/₂ digit A/D converter combining both linear CMOS and
digital CMOS circuits on a single monolithic IC. Available in a 24–Lead DIP type package, this device is de-
signed to minimize use of external components. With two external resistors and two external capacitors, the
system forms a dual slope A/D converter with automatic zero correction and automatic polarity.
The NTE2055 is ratiometric and may be used over a full–scale range from 1.999V to 199.9mV. Systems using
this device may operate over a wide range of power supply voltages for ease of use with batteries, or with stan-
dard 5V supplies. The output drive conforms with standard B–Series CMOS specifications and can drive a
low–power Schottky TTL load.
The high impedance MOS inputs allow applications in current and resistance meters as well as voltmeters.
In addition to DVM/DPM applications, the NTE2055 finds use in digital thermometers, digital scales, remote
A/D, A/D control systems, and in MPU systems.
Features:
D Accuracy: ±0.05% of Reading ±1 Count
D Two Voltage Ranges: 1.999V and 199.9mV
D Up to 25 Conversions /s
D Z_in > 100MΩ
D Auto–Polarity and Auto–Zero
D Single Positive Voltage Reference
D Standard B–Series CMOS Outputs: Drives One Low Power Schottky Load
D Uses On–Chip System Clock, or External Clock
D Wide Supply Range: e.g., ±4.5V to ±8.0V
D Overrange and Underrange Signals Available
D Operates in Auto Ranging Circuits
D Operates with LED and LCD Displays
D Low External Component Count
D Chip Complexity: 1326 FETs
Absolute Maximum Ratings:
DC Supply Voltage, V_DD to V_EE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to +18V
Voltage, Ant Pin, Referenced to V_EE, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to V_DD+0.5V
DC Input Current, Per Pin, I_in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10mA
Operating Temperature Range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C
Storage Temperature Range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Note
1. This device contains circuitry to protect the inputs against damage due to high static voltages or electric
fields; however, it is advised that normal precautions be taken to avoid applications of any voltage higher
than maximum rated voltages to this high impedance circuit. For proper operation it is recommended that
V_in and V_out be constrained to the range V_EE ≤ (V_in or V_out) ≤ V_DD.
Recommended Operating Conditions: (V_SS = 0 or V_EE)
DC Supply Voltage
V_DD to Analog GND, V_DD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5.0 to 8.0V
V_EE to Analog GND, V_EE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2.8 to –8.0V
Clock Frequency, f_Clk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 to 400kHz
Zero Offset Correction Capacitor, C_o . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 ±20%µF