AD7992 Analog Devices, AD7992 Datasheet - Page 8

• Manufacturer Part Number: AD7992
• Description: 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP
• Manufacturer: Analog Devices

Specifications of AD7992

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: 79kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOP

AD7992
PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS
Table 5. Pin Function Descriptions
Pin No.
2, 7
3
4
5
6
1
8
9
10
Table 6. I
Part Number
AD7992-0
AD7992-0
AD7992-1
AD7992-1
AD7992-x
1
If the AS pin is left floating on any of the AD7992 parts, the device address is 010 0000. This gives each AD7992 device three different address options.
2
1
C Address Selection
Mnemonic
AGND
V
V
V
AS
CONVST
ALERT/BUSY
SDA
SCL
DD
IN
IN
2/REF
1
IN
Function
Analog Ground. Ground reference point for all circuitry on the AD7992. All analog input signals should be
referred to this GND voltage.
Power Supply Input. The V
Analog Input 2/Voltage Reference Input. In single-channel mode, this pin becomes the reference voltage input;
an external reference should be applied at this pin. The external reference input range is 1.2 V to V
and 1µF capacitor should be tied between this pin and AGND. If Bit D6 is set to 1 in the configuration register,
the AD7992 operates in single-channel mode. In dual-channel mode, D6 in the configuration register is 0; in
this case, this pin provides the second analog input channel. The reference voltage for the AD7992 is taken
from the power supply voltage in dual-channel mode. See the Configuration Register section and Table 10.
Analog Input 1. Single-ended analog input channel. The input range is 0 V to REF
Logic Input. Address select input that selects one of three I
Logic Input Signal. Convert start signal. This is an edge-triggered logic input. The rising edge of this signal
powers up the part. The power up time for the part is 1 µs. The falling edge of CONVST places the track-and-
hold into hold mode and initiates a conversion. A power-up time of at least 1 µs must be allowed for the
CONVST high pulse; otherwise, the conversion result is invalid (see the Modes of Operation section).
Digital Output. Selectable as an ALERT or BUSY output function. When configured as an ALERT, this pin acts as
an out-of-range indicator and, if enabled, becomes active when the conversion result violates the DATA
DATA
active when a conversion is in progress. Open-drain output. An external pull-up resistor is required.
Digital I/O. Serial bus bidirectional data. Open-drain output. An external pull-up resistor is required.
Digital Input. Serial bus clock. Open-drain output. An external pull-up resistor is required.
LOW
register values. See the Limit Registers section. When configured as a BUSY output, this pin becomes
AS Pin
GND
V
GND
V
Float
DD
DD
V
IN
CONVST
2/REF
Figure 3. AD7992 Pin Configuration
DD
AGND
V
range for the AD7992 is from 2.7 V to 5.5 V.
V
IN
DD
IN
1
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1
2
3
4
5
(Not to Scale)
AD7992
TOP VIEW
10
9
8
7
6
SCL
SDA
ALERT
AGND
I
010 0001
010 0010
010 0011
010 0100
010 0000
AS
2
C Address
2
C addresses for the AD7992, as shown in Table 6.
IN
.
DD
. A 0.1 µF
HIGH
or