SBAS311 − MARCH 2004
C0076C0111C0119C0262C0080C0111C0119C0101C0114C0044C0032C0083C0121C0110C0099C0104C0114C0111C0110C0111C0117C0115
C0086C0111C0108C0116C0097C0103C0101C0262C0116C0111C0262C0070C0114C0101C0113C0117C0101C0110C0099C0121C0032C0067C0111C0110C0118C0101C0114C0116C0101C0114
C0065C0068C0083C0049C0050C0048C0054
C0065C0068C0083C0049C0050C0048C0055
FEATURES
C0068 Syncronous Operation
C0068 Frequency Set By External Clock
C0068 Maximum Input Frequency:
− 1MHz for ADS1206
− 4MHz for ADS1207
C0068 Selectable High-Impedance Buffered Input
C0068 2% Internal, 2.5V Reference Voltage
C0068 High-Current Output Driver
C0068 Power Supply 3.3V or 5V
C0068 Low Power : 3mW (typ)
C0068 Alternate Source for AD7740
C0068 −40°C to +85°C Operating Temperature Range
APPLICATIONS
C0068 Galvanic Isolation Measurement
C0068 High Voltage Measurement
C0068 Low-Cost Analog-to-Digital Conversion
C0068 Motor Control
C0068 Industrial Process Control
C0068 Instrumentation
C0068 Smart Transmitters
C0068 Portable Instruments
DESCRIPTION
The ADS1206 and ADS1207 are a low-cost,
high-performance, synchronous voltage-to-frequency
converters (VFC). Both devices can operate from a single
3.0V to 3.6V or 4.5V to 5.5V power supply, consuming only
1mA. The output signal is synchronous with the input
clock, CLKIN. The clock input is TTL- and CMOS-
compatible and the onboard clock generator can also
accept an external crystal or resonator. The maximum
input clock frequency for the ADS1206 is 1MHz and for the
ADS1207 is 4MHz. The clock divider on the ADS1207
scales the input frequency to 2MHZ, which permits the
core to operate at the higher rate. The high-impedance
input is ideal for direct connection to high-impedance
transducers or high-voltage resistive dividers. Counting
output pulses over a 4ms period results in an effective
12-bit resolution for the ADS1206 using a 1MHz input
clock. For the ADS1207 using a 4MHz input clock, the
same result occurs over a 2ms period. Both devices are
designed for use in medium-resolution measurements.
They are available in an 8-lead VSSOP package.
1kΩ Reference
Voltage
2.5V
Modulator
−2
Bufferx1
REFIN/OUT
CLKOUT
ADS1207
Only
CLKIN
FOUTVIN
BUF
PRODUCT PREVIEW
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Copyright  2004, Texas Instruments Incorporated
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semiconductor products and disclaimers thereto appears at the end of this data sheet.
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