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參數(shù)資料
| 型號： | AD7783BRU |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT 2CH R-R 16-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 96 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 19.79 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 3.9mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個(gè)差分，單極；1 個(gè)差分，雙極 |
–6–
AD7783
PIN CONFIGURATION
TOP VIEW
(Not to Scale)
XTAL1
AD7783
REFIN(+)
REFIN(–)
AIN(+)
AIN(–)
IOUT1
IOUT2
IPIN
XTAL2
VDD
GND
MODE
DOUT/
RDY
CS
SCLK
RANGE
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Function
1
XTAL1
Input to the 32.768 kHz Crystal Oscillator Inverter.
2
REFIN(+)
Positive Reference Input. REFIN(+) can lie anywhere between VDD and GND + 1 V. The nominal refer-
ence voltage (REFIN(+) – REFIN(–)) is 2.5 V, but the part functions with a reference from 1 V to VDD.
3REFIN(–)Negative Reference Input. This reference input can lie anywhere between GND and VDD – 1 V.
4
AIN(+)
Analog Input. AIN(+) is the positive terminal of the fully differential analog input pair AIN(+)/AIN(–).
5
AIN(–)Analog Input. AIN(–) is the negative terminal of the fully differential analog input pair AIN(+)/AIN(–).
6
IOUT1
Output from Internal 200
mA Excitation Current Source. Either current source IEXC1 or IEXC2 can be
switched to this output using hardware control pin IPIN.
7
IOUT2
Output from Internal 200
mA Excitation Current Source. Either current source IEXC1 or IEXC2 can be
switched to this output using hardware control pin IPIN.
8
IPIN
Logic Input that Selects the Routing of the On-Chip Current Sources. When IPIN is tied to GND, IEXC1
is routed to IOUT1 and IEXC2 is routed to IOUT2. When IPIN is tied to VDD, IEXC1 is routed to
IOUT2 and IEXC2 is routed to IOUT1.
9
RANGE
Logic Input that Configures the Input Range on the Internal PGA. With RANGE = 0, the full-scale input
range is
±160 mV; the full-scale input range equals ±2.56 V when RANGE = 1 for a 2.5 V reference.
10
SCLK
Serial Clock Input/Output for Data Transfers from the ADC. When the device is operated in master mode,
SCLK is an output with one SCLK period equal to one XTAL period. In slave mode, SCLK is generated
by an external source. In slave mode, all the data can be transmitted on a continuous train of pulses. Alter-
natively, it can be a noncontinuous clock with the information being transmitted from the AD7783 in
smaller batches of data. SCLK is Schmitt triggered (slave mode), making the interface suitable for opto-
isolated applications.
11
CS
Chip Select Input.
CS is an active low logic input used to select the AD7783. When CS is low, the PLL
establishes lock and allows the AD7783 to initiate a conversion. When
CS is high, the conversion is aborted,
DOUT and SCLK are three-stated, the AD7783 enters standby mode, and any conversion result in the
output shift register is lost.
12
DOUT/
RDY Serial Data Output/Data Ready Output. DOUT/RDY serves a dual purpose in this interface. When a conver-
sion is initiated, DOUT/
RDY goes high and remains high until the conversion is complete. DOUT/RDY will
then return low to indicate that valid data is available to be read from the device. In slave mode, this acts as
an interrupt to the processor, indicating that valid data is available. If data is not read after a conversion,
DOUT/
RDY will go high before the next update occurs. In master mode, DOUT/RDY goes low for at
least half an SCLK cycle before the device produces SCLKs. When SCLK becomes active, data is output
on the DOUT/
RDY pin. Data is output on the falling SCLK edge and is valid on the rising edge.
13
MODE
The MODE pin selects master or slave mode of operation. When MODE = 0, the AD7783 operates in
master mode; the AD7783 is configured for slave mode when MODE = 1.
14
GND
Ground Reference Point for the AD7783.
15
VDD
Supply Voltage, 3 V or 5 V Nominal.
16
XTAL2
Output from the 32.768 kHz Crystal Oscillator Inverter.
REV. C
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