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PRELIMINARY TECHNICAL DATA
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4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP AD7994/AD7993 Preliminary Technical Data
FUNCTIONAL BLOCK DIAGRAM
VDD GND REFIN CONVST
FEATURES 12-Bit ADC with Fast Conversion Time: 2 µs Four Single-Ended Analog Input Channels Specified for VDD of 2.7 V to 5.5 V Low Power Consumption Fast Throughput Rate:- 188 KSPS Sequencer Operation Automatic Cycle Mode I2CR Compatible Serial Interface I2CR Interface supports: Standard, Fast, and High-Speed Modes Out of Range Indicator/Alert Function Pin-Selectable Addressing via AS Two Versions Allow Five I2C Addresses Shutdown Mode: 1µA max 16-Lead TSSOP Package
AD7994/AD7993
VIN1 VIN2 VIN3 VIN4 T/H I/P MUX 12-/10-BIT SUCCESSIVE APPROXIMATION ADC CONTROL LOGIC
OSCILLATOR
DATALOW LIMIT REGISTER CH1-CH4
CONVERSION RESULT REGISTER CONFIGURATION REGISTER ALERT STATUS REGISTER CYCLE TIMER REGISTER I2C INTERFACE SCL SDA ALERT
DATAHIGH LIMIT REGISTER CH1-CH4
GENERAL DESCRIPTION
HYSTERESIS REGISTER CH1-CH4 AS
The AD7994/AD7993 are 4 channel, 12-/10-bit, high speed, low power, successive-approximation ADCs respectively. They operate from a single 2.7 V to 5.5 V power supply and feature a conversion time of 2 µs. The parts contain a four channel multiplexer and track/hold amplifier which can handle input frequencies in excess of TBD kHz. The AD7994/AD7993 provide a two-wire serial interface which is compatible with I2C interfaces. The parts come in two versions, AD7994-0/AD7993-0 to AD7994-1/ AD7993-1. Each version allows for a minimum of two different I2C addresses. The I2C interface on the AD79940/AD7993-0 supports Standard and Fast I2C Interface Modes. The I2C interface on the AD7994-1/AD7993-1 supports Standard, Fast and two High-Speed I2C Interface Modes. The AD7994/AD7993 normally remain in a shutdown state while not converting, powering up only for conversions. The conversion process can be controlled using the CONVST pin, an Automatic Conversion Cycle selected through software control, or a mode where conversions occur across Write operations. There are no pipeline delays associated with the part. The reference for the part is applied externally to the REFIN pin and can be in the range of 1.2V to VDD. This allows the widest dynamic input range to the ADC.
GND
On-chip registers can be programmed with high and low limits for the conversion result, and an open drain Out of Range Indicator output (ALERT), becomes active when the programmed high or low limits are violated by the conversion result. This output can be used as an interrupt.
PRODUCT HIGHLIGHTS
1. 2 µs Conversion time with low power consumption. 2. I2C Compatible Serial Interface with pin selectable addresses. Two AD7994/AD7993 versions allow five AD7994/AD7993 devices to be connected to the same serial bus. 3. The parts feature automatic shutdown while not converting to maximize power efficiency. Current consumption is 1µA max when in shutdown. 4. Reference can be driven up to the powe.
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