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參數資料
| 型號： | AD7894AR-2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | VARISTOR 30VRMS 14MM RADIAL |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 4/12頁 |
| 文件大小： | 131K |
| 代理商： | AD7894AR-2 |
AD7894
–4–
REV. 0
ORDERING GUIDE
Temperature
Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C
to +85
°
C
–40
°
C to +85
°
C
Package
Description
Package
Option
Model
INL
±
2 LSB
±
1.5 LSB
±
2 LSB
±
1.5 LSB
±
2 LSB
Input Range
±
10 V
±
10 V
±
2.5 V
±
2.5 V
0 V to +2.5 V
SNR
AD7894AR-10
AD7894BR-10
AD7894AR-3
AD7894BR-3
AD7894AR-2
77 dB
77 dB
77 dB
77 dB
77 dB
8-Lead Narrow Body SOIC
8-Lead Narrow Body SOIC
8-Lead Narrow Body SOIC
8-Lead Narrow Body SOIC
8-Lead Narrow Body SOIC
SO-8
SO-8
SO-8
SO-8
SO-8
PIN FUNCTION DESCRIPTIONS
Pin
No.
Pin
Mnemonic
Description
1
REF IN
Voltage Reference Input. An external reference source should be connected to this pin to provide the
reference voltage for the AD7894’s conversion process. The REF IN input is buffered on-chip. The
nominal reference voltage for correct operation of the AD7894 is +2.5V.
Analog Input Channel. The analog input range is
±
10 V (AD7894-10),
±
2.5 V (AD7894-3) and 0 V to
+2.5V (AD7894-2).
Analog Ground. Ground reference for track/hold, comparator, digital circuitry and DAC.
Serial Clock Input. An external serial clock is applied to this input to obtain serial data from the AD7894.
A new serial data bit is clocked out on the falling edge of this serial clock. Data is guaranteed valid for
10 ns after this falling edge so data can be accepted on the falling edge when a fast serial clock is used.
The serial clock input should be taken low at the end of the serial data transmission.
Serial Data Output. Serial data from the AD7894 is provided at this output. The serial data is clocked
out by the falling edge of SCLK, but the data can also be read on the falling edge of SCLK. This is pos-
sible because data bit N is valid for a specified time after the falling edge of SCLK (data hold time) (see
Figure 5). Sixteen bits of serial data are provided as two leading zeroes followed by the 14 bits of conver-
sion data. On the 16th falling edge of SCLK, the SDATA line is held for the data hold time and then
disabled (three-stated). Output data coding is twos complement for the AD7894-10 and AD7894-3, and
straight binary for the AD7894-2.
The BUSY pin is used to indicate when the part is doing a conversion. The BUSY pin will go high on
the falling edge of
CONVST
and will return low when the conversion is complete.
Conversion Start. Edge-triggered logic input. On the falling edge of this input, the track/hold goes into its
hold mode and conversion is initiated. If
CONVST
is low at the end of conversion, the part goes into
power-down mode. In this case, the rising edge of
CONVST
will cause the part to begin waking up.
Positive supply voltage, +5 V
±
5%.
2
V
IN
3
4
GND
SCLK
5
SDATA
6
BUSY
7
CONVST
8
V
DD
1.6mA
400
m
A
+1.6V
TO
OUTPUT
PIN
50pF
Figure 1. Load Circuit for Access Time and Bus
Relinquish Time
PIN CONFIGURATION
SOIC (SO-8)
TOP VIEW
(Not to Scale)
8
7
6
5
1
2
3
4
REF IN
V
IN
GND
V
DD
CONVST
BUSY
SDATA
SCLK
AD7894
相關PDF資料 |
PDF描述 |
|---|---|
| AD7894AR-3 | VARISTOR 320V RMS 14MM RADIAL |
| AD7894BR-10 | SWITCH SLIDE SPDT R/A .5A PCB |
| AD7894BR-3 | SWITCH SLIDE SPDT .3A SMD |
| AD7895AN-3 | 5 V, 12-Bit, Serial 3.8 ms ADC in 8-Pin Package |
| AD7895AR-10 | 5 V, 12-Bit, Serial 3.8 ms ADC in 8-Pin Package |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7894AR-2REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 14-bit Serial 8-Pin SOIC N T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 14BIT SERL 8SOIC N - Tape and Reel |
| AD7894AR-2REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 14-bit Serial 8-Pin SOIC N T/R |
| AD7894AR-2Z | 制造商:Analog Devices 功能描述:ADC 14BIT 5V 7.5MHZ 2LSB 制造商:Analog Devices 功能描述:ADC, 14BIT, 5V, 7.5MHZ, 2LSB, 8SOIC; Resolution (Bits):14bit; Sampling Rate:200kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:5.5mA; Digital IC Case Style:NSOIC; No. of Pins:8; ;RoHS Compliant: Yes |
| AD7894AR-3 | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 14-bit Serial 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:SERIAL 14-BIT ADC I.C. - Bulk 制造商:Analog Devices 功能描述:CONVERTOR ((NW)) |
| AD7894AR-3REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 14-bit Serial 8-Pin SOIC N T/R |
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