TC850

Features:

• 15-bit Resolution Plus Sign Bit
• Up to 40 Conversions per Second
• Integrating ADC Technique
- Monotonic
- High Noise Immunity
- Auto Zeroed Amplifiers Eliminate Offset Trimming
• Wide Dynamic Range: 96dB
• Low Input Bias Current: 30pA
• Low Input Noise: 30µVP-P
• Sensitivity: 100µV
• Flexible Operational Control
• Continuous or On Demand Conversions
• Data Valid Output
• Bus Compatible, 3-State Data Outputs
- 8-BitDataBus
- SimpleµP Interface
- Two Chip Enables
- Read ADC Result Like Memory
• ± 5V Power Supply Operation: 20mΩ
• 40-Pin Dual-in-Line or 44-Pin PLCC Packages




Application

• Precision Analog Signal Processor
• Precision Sensor Interface
• High Accuracy DC Measurements




Pinout






Specifications

Positive Supply Voltage..................................+6V
Negative Supply Voltage ............................... - 9V
Analog Input Voltage (IN+ pr IN-) ..... VDD to VSS
Voltage Reference Input:
(REF1+, REF1, REF2+)...................... VDD to VSS
Logic Input Voltage.......VDD+ 0.3V to GND  0.3V
Current Into Any Pin.....................................10mA
While Operating .........................................100µA
Ambient Operating Temperature Range
C Device........................................0°C to +70°C
I Device......................................-25°C to +85°C
Package Power Dissipation (TA  70°C)
CerDIP ........................................................2.29Ω
Plastic DIP....................................................1.23Ω
Plastic PLCC ................................................1.23Ω

Parameter Name	Value
Supply Voltage (V)	5
Input Voltage Range (V)	Vss + 1.5 to Vdd - 1.5
DMM	No
Max Power (mW)	35
Resolution (Digits)	15
Resolution (Counts)	32768
Interface	8-bit Parallel
Temp Range (°C)	-25 to +70
Device Description	Binary A/D

Parameter NameValueSupply Voltage (V)5Input Voltage Range (V)Vss + 1.5 to Vdd - 1.5DMMNoMax Power (mW)35Resolution (Digits)15Resolution (Counts)32768Interface8-bit ParallelTemp Range (°C)-25 to +70Device DescriptionBinary A/D




Description

The TC850 is a monolithic CMOS A/D converter (ADC) with resolution of 15-bits plus sign. It combines a chopper- stabilized buffer and integrator with a unique multiple- slope integration technique that increases conversion speed. The result is 16 times improvement in speed over previous 15-bit, monolithic integrating ADCs (from 2.5 conversions per second up to 40 per second). Faster conversion speed is especially welcome in systems with human interface, such as digital scales.

The TC850 incorporates an ADC and a µP-compatible digital interface. Only a voltage reference and a few, noncritical, passive components are required to form a complete 15-bit plus sign ADC. CMOS processing provides the TC850 with high-impedance, differentialinputs. Input bias current is typically only 30pA, permitting direct interface to sensors. Input sensitivity of 100µV per least significant bit (LSB) eliminates the

The TC850 is a monolithic CMOS analog-to-digital converter (ADC)with resolution of 15-bits plus sign. It combines a chopper-stabilized buffer and integrator with a unique multiple-slope integration technique that increases conversion speed. The result is 16 times improvement in speed over previous 15-bit, monolithic integrating ADCs (from 2.5 conversions per sec up to 40 per sec). Faster conversion speed is especially welcome in systems with human interface,such as digital scales. The TC850 incorporates an ADC and a P-compatible digital interface. Only a voltage referenceand a few noncritical passive components are required to form a complete 15-bit plus sign ADC. CMOS processing provides the TC850 with high-impedance differential inputs.Input bias current is typically only 30pA, permitting direct interface to sensors. Input sensitivity of 100 V per least significant bit (LSB)eliminates the need for precision external amplifiers. The internal amplifiers are auto-zeroed,guaranteeing a zero digital output with 0V analog input. Zero adjustment potentiometers or calibrations are not required. The TC850 outputs data on an 8-bit, 3-state bus. Digital inputs are CMOS compatible;outputs are TTL/CMOS compatible. Chip-enable and byte-select inputs combined with an end-of-conversion output ensures easy interfacing to a wide variety of microprocessors. Conversions can be performed continuously or on command.In continuous mode, data is read as three consecutive bytes and manipulation of address lines is not required. Operating from ±5V supplies,the TC850 dissipates only 20mW.It is packaged in 40-pin plastic or ceramic dual-in-line packages (DIPs)and in a 44-pin plastic leaded chip carrier (PLCC),surface-mount package.