AD7887AR-REEL7 Analog Devices Inc, AD7887AR-REEL7 Datasheet - Page 7

• Manufacturer Part Number: AD7887AR-REEL7
• Description: IC,Data Acquisition System,2-CHANNEL,12-BIT,SOP,8PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of AD7887AR-REEL7

• Rohs Status: RoHS non-compliant
• Design Resources: Software Calibrated, 1 MHz to 8 GHz, 70 dB RF Power Measurement System Using AD8318 (CN0150)
• Number Of Bits: 12
• Sampling Rate (per Second): 125k
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 3.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
CS
V
GND
AIN1/V
AIN0
DIN
DOUT
SCLK
DD
AIN1/V
REF
Figure 3. SOIC_N Pin Configuration
GND
V
REF
CS
DD
Description
Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7887
and also frames the serial data transfer. When the AD7887 operates in its default mode, the CS pin also acts as
the shutdown pin such that with the CS pin high, the AD7887 is in its power-down mode.
Power Supply Input. The V
two-channel operation, this pin also provides the reference source for the part.
Ground Pin. This pin is the ground reference point for all circuitry on the AD7887. In systems with separate AGND
and DGND planes, these planes should be tied together as close as possible to this GND pin. Where this is not
possible, this GND pin should connect to the AGND plane.
Analog Input 1/Voltage Reference Input. In single-channel mode, this pin becomes the reference input/output.
In this case, the user can either access the internal 2.5 V reference or overdrive the internal reference with the
voltage applied to this pin. The reference voltage range for an externally applied reference is 1.2 V to V
channel mode, this pin provides the second analog input channel, AIN1. The input voltage range on AIN1 is
0 to V
Analog Input 0. In single-channel mode, this is the analog input and the input voltage range is 0 to V
channel mode, it has an analog input range of 0 to V
Data In. Logic Input. Data to be written to the AD7887’s control register is provided on this input and clocked into
the register on the rising edge of SCLK (see the Control Register section). The AD7887 can be operated as a
single-channel, read-only ADC by tying the DIN line permanently to GND.
Data Out. Logic output. The conversion result from the AD7887 is provided on this output as a serial data stream.
The bits are clocked out on the falling edge of the SCLK input. The data stream consists of four leading zeros
followed by the 12 bits of conversion data, which is provided MSB first.
Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part and writing serial data to
the control register. This clock input is also used as the clock source for the AD7887’s conversion process.
1
2
3
4
(Not to Scale)
AD7887
TOP VIEW
DD
.
8
7
6
5
SCLK
DOUT
DIN
AIN0
DD
range for the AD7887 is from 2.7 V to 5.25 V. When the AD7887 is configured for
Rev. D | Page 7 of 24
DD
.
AIN1/V
Figure 4. MSOP Pin Configuration
GND
V
REF
CS
DD
1
2
3
4
(Not to Scale)
AD7887
TOP VIEW
8
7
6
5
SCLK
DOUT
DIN
AIN0
REF
AD7887
DD
. In dual-
. In two-