High-Performance, Stand-Alone ADCs for a Variety of Embedded Systems Applications
12 ADC Converter Function Pack Design Guide
ADC Converter Function Pack Design Guide 13
High-Performance, Stand-Alone ADCs for a Variety of Embedded Systems Applications
The TC850 is a monolithic CMOS A/D converter (ADC) with
a resolution of 15-bits plus sign. It combines a chopper-
stabilized buffer and integrator with a unique multi-slope
integration technique that increases conversion speed. The
result is a 16-time 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 microprocessor-
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 and differential inputs. Input bias
current is typically only 30 pA, permitting direct interface to
sensors.
ADC BY ARCHITECTURE – 15-BIT BINARY OUTPUT ADC INCLUDES AUTO-ZEROED AMPLIFIERS
ADC Product Specifications
Part
Description
Supply
Voltage
(V)
Input Voltage Range
(V)
Resolution
(Digits)
Resolution
(Counts)
Max Power
(mW)
Data
Interface
Temp.
Range
(°C) Features Packages
TC850 Binary A/D ±5 V
SS
+ 1.5V to
V
DD
– 1.5V
15-bit ±32,768 35 8-bit
Parallel
-25 to +70 Highest conversion
speed (40 conv/sec)
44 PLCC, 40 PDIP,
40 CerDIP
Input sensitivity of 100 µV per Least Significant Bit (LSB)
eliminates the need for precision external amplifiers.
The internal amplifiers are auto-zeroed, ensuring 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, while 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 20 mΩ.
Key Features:
n 15-bit Resolution Plus Sign Bit
n Up to 40 Conversions per Second
n Integrating ADC Technique
– Monotonic
– High Noise Immunity
– Auto-zeroed Amplifiers Eliminate Offset Trimming
n Wide Dynamic Range: 96 dB
n Low Input Bias Current: 30 pA
n Low Input Noise: 30 µVP-P
n Sensitivity: 100 µV
n Flexible Operational Control
n Continuous or On-demand Conversions
n Data Valid Output
n Bus Compatible, 3-State Data Outputs
– 8-bit Data Bus
– Simple µP Interface
– Two Chip Enables
– Read ADC Result Like Memory
n ± 5V Power Supply Operation: 20 mΩ
Applications:
n Precision Analog Signal Processor
n Precision Sensor Interface
n High Accuracy DC Measurments
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