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AD5687RBCPZ-RL7 Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD5687RBCPZ-RL7
Szczegółowy opis  Dual, 16-/12-Bit nanoDAC with 2 ppm/째C Reference, SPI Interface
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Strona internetowa  http://www.analog.com
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AD5687RBCPZ-RL7 Arkusz danych(HTML) 10 Page - Analog Devices

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AD5689R/AD5687R
Data Sheet
Rev. 0 | Page 10 of 28
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 6. 16-Lead LFCSP Pin Configuration
Figure 7. 16-Lead TSSOP Pin Configuration
Table 7. Pin Function Descriptions
Pin No.
Mnemonic
Description
LFCSP
TSSOP
1
3
VOUTA
Analog Output Voltage from DAC A. The output amplifier has rail-to-rail operation.
2
4
GND
Ground Reference Point for All Circuitry on the AD5689R/AD5687R.
3
5
VDD
Power Supply Input. The AD5689R/AD5687R can be operated from 2.7 V to 5.5 V. Decouple the supply
with a 10 µF capacitor in parallel with a 0.1 µF capacitor to GND.
4
6
NC
No Connect. Do not connect to this pin.
5
7
VOUTB
Analog Output Voltage from DAC B. The output amplifier has rail-to-rail operation.
6
8
SDO
Serial Data Output. SDO can be used to daisy-chain a number of AD5689R/AD5687R devices together,
or it can be used for readback. The serial data is transferred on the rising edge of SCLK and is valid on
the falling edge of the clock.
7
9
LDAC
LDAC can be operated in two modes: asynchronous and synchronous. Pulsing this pin low allows
either or both DAC registers to be updated if the input registers have new data; both DAC outputs can
be updated simultaneously. This pin can also be tied permanently low.
8
10
GAIN
Gain Select. When this pin is tied to GND, both DACs output a span from 0 V to VREF. If this pin is tied to
VLOGIC, both DACs output a span of 0 V to 2 × VREF.
9
11
VLOGIC
Digital Power Supply. Voltage ranges from 1.8 V to 5.5 V.
10
12
SCLK
Serial Clock Input. Data is clocked into the input shift register on the falling edge of the serial clock
input. Data can be transferred at rates of up to 50 MHz.
11
13
SYNC
Active Low Control Input. This is the frame synchronization signal for the input data. When SYNC goes
low, data is transferred in on the falling edges of the next 24 clocks.
12
14
SDIN
Serial Data Input. This device has a 24-bit input shift register. Data is clocked into the register on the
falling edge of the serial clock input.
13
15
RESET
Asynchronous Reset Input. The RESET input is falling edge sensitive. When RESET is low, all LDAC pulses
are ignored. When RESET is activated, the input register and the DAC register are updated with zero scale
or midscale, depending on the state of the RSTSEL pin.
14
16
RSTSEL
Power-On Reset Select. Tying this pin to GND powers up both DACs to zero scale. Tying this pin to
VLOGIC powers up both DACs to midscale.
15
1
VREF
Reference Voltage. The AD5689R/AD5687R have a common reference pin. When using the internal
reference, this is the reference output pin. When using an external reference, this is the reference input
pin. The default for this pin is as a reference output.
16
2
NC
No Connect. Do not connect to this pin.
17
N/A
EPAD
Exposed Pad. The exposed pad must be tied to GND.
12
11
10
1
3
4
SDIN
SYNC
SCLK
9
VLOGIC
VOUTA
VDD
2
GND
NC
TOP VIEW
(Not to Scale)
AD5689R/
AD5687R
NOTES
1. THE EXPOSED PAD MUST BE TIED TO GND.
2. NC = NO CONNECT. DO NOT CONNECT TO
THIS PIN.
1
2
3
4
5
6
7
8
NC
NC
GND
VOUTB
VOUTA
VDD
VREF
SDO
16
15
14
13
12
11
10
9
RESET
SDIN
SYNC
GAIN
LDAC
VLOGIC
SCLK
RSTSEL
NOTES
1. NC = NO CONNECT. DO NOT CONNECT
TO THIS PIN.
TOP VIEW
(Not to Scale)
AD5689R/
AD5687R


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