NTE NTE2051, NTE2050 Datasheet

NTE2050 & NTE2051

Integrated Circuit

31/2–Digit Single Chip A/D Converter

Description:

The NTE2050 and NTE2051 are high performance, low power 3–1/2 digit A/D converters containing
all the necessary active devices on a single CMOS IC. Included are seven segment decoders, display
drivers, reference and a clock. The NTE2051 is designed to interface with a liquid crystal display
(LCD) and includes a backplane drive; the NTE2050 will directly drive an instrument–size light emit­ting diode (LED) display.

The NTE2050 and NTE2051 bring together an unprecedented combination of high accuracy, versatil­ity, and true economy. High accuracy like auto–zero to less than 10µV, zero drift of less than 1µV/°C,
input bias current of 10pA max., and roll–over error of less than one count. The versatility of true differ­ential input and reference is useful in all systems, but gives the designer an uncommon advantage
when measuring load cells, strain gauges and other bridge–type transducers. And, finally, the true
economy of single power supply operation (NTE2051), enabling a high performance panel meter to
be built with the addition of only 7 passive components and a display.

Features:

D Guaranteed Zero Reading for 0 Volts Input on all Scales
D True Polarity at Zero for Precise Null Detection
D Input Current: 1pA Typ
D True Differential Input and Reference
D Direct Display Drive – No External Components Required:

NTE2050 (LED)
NTE2051 (LCD)

D Low Noise – Less than 15µV
D On–Chip Clock and Reference
D Low Power Dissipation – Typically Less than 10mW
D No Additional Active Circuits Required

P–P

Absolute Maximum Ratings:

Supply Voltage,

NTE2051, V+ to V– 15V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NTE2050, V+ to GND +6V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NTE2050, V– to GND –9V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog Input Voltage (Either Input, Note 2) V+ to V–. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reference Input Voltage (Either Input) V+ to V–. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clock Input,

NTE2051 TEST to V+. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NTE2050 GND to V+. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Dissipation (Note 3) 800mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Temperature Range 0° to +70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage Temperature Range –65° to +160°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead Temperature (During Soldering, 60sec) +300°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Note 1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent

damage to the device. These are stress ratings only, and functional operation of the device
at these or another conditions above those indicated in the operational section of the specifi­cation is not implied. Exposure to absolute maximum rating conditions for extended periods

may affect device reliability.
Note 2. Input v oltages m ay e xceed t he s upply voltages p rov ided t he i nput c urr ent is l im ited t o ±100µA.
Note 3. Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.

Electrical Characteristics: (TA = +25°C, f

Parameter Test Conditions Min Typ Max Unit

Zero Input Reading VIN = 0V

Full Scale = 200mV

Ratiometric Reading VIN = V

V

Rollover Error (Difference in

Reading for Equal Positive and
Negative Reading near Full
Scale)

Linearity (Maximum Deviation

from Best Straight Line Fit)

Common Mode Rejection Ratio VCM = ±1V, VIN = 0V

Noise (Peak–Peak Value not

Exceeded 95% of Time)
Leakage Current | Input VIN = 0 – 1 10 pA
Zero Reading Drift VIN = 0, 0° < TA < +70°C – 0.2 1.0 µV/°C
Scale Factor Temperature

Coefficient

–VIN = +VIN ] 200mV –1 ±.2 +1 Counts

Full Scale = 200mV
or Full Scale = 2V

Full Scale = 200mV
VIN = 0V

Full Scale = 200mV

VIN = 199.0mV
0° < T
(Ext. Ref. 0ppm/°C)

= 100mV

REF

A

REF

< +70°C

= 48kHz unless otherwise specified)

clock

–000.0 ±000.0 +000.0 Digital Reading

999 999/1000 1000 Digital Reading

–1 ±.2 +1 Counts

– 50 – µV/V

– 15 – µV

– 1 5 ppm/°C

V+ Supply Current (Does Not

Include LED Current for

NTE2050)
V– S upply C urrent (NTE2050 O nly) – 0.6 1.8 mA

VIN = 0 – 0.8 1.8 mA