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參數資料
| 型號： | AD7856ARSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 30/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 8CHAN 5V 24SSOP |
| 標準包裝： | 1 |
| 位數： | 14 |
| 采樣率（每秒）： | 285k |
| 數據接口： | 8051，QSPI?，串行，SPI? µP |
| 轉換器數目： | 2 |
| 功率耗散（最大）： | 89.25mW |
| 電壓電源： | 模擬和數字 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 24-SSOP |
| 包裝： | 管件 |
| 輸入數目和類型： | 8 個單端，單極；4 個偽差分，單極 |
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AD7856
–7–
REV. A
PIN FUNCTION DESCRIPTIONS
Pin
Mnemonic
Description
1
CONVST
Convert Start. Logic Input. A low to high transition on this input puts the track/hold into its hold mode
and starts conversion. When this input is not used, it should be tied to DVDD.
2
BUSY
Busy Output. The busy output is triggered high by the falling edge of
CONVST or rising edge of CAL,
and remains high until conversion is completed. BUSY is also used to indicate when the AD7856 has
completed its on-chip calibration sequence.
3
SLEEP
Sleep Input/Low Power Mode. A Logic 0 initiates a sleep, and all circuitry is powered down, including
the internal voltage reference, provided there is no conversion or calibration being performed. Calibration
data is retained. A Logic 1 results in normal operation. See Power-Down section for more details.
4
REFIN/REFOUT
Reference Input/Output. This pin is connected to the internal reference through a series resistor and is
the reference source for the analog-to-digital converter. The nominal reference voltage is 4.096 V and
this appears at the pin. This pin can be overdriven by an external reference or can be taken as high as
AVDD. When this pin is tied to AVDD, or when an externally applied reference approaches AVDD, the
CREF1 pin should also be tied to AVDD.
5AVDD
Analog Positive Supply Voltage, +5.0 V
± 5%.
6
AGND
Analog Ground. Ground reference for track/hold, reference and DAC.
7CREF1
Reference Capacitor (0.1
F Multilayer Ceramic in parallel with a 470 nF NPO type). This external
capacitor is used as a charge source for the internal DAC. The capacitor should be tied between the pin
and AGND.
8CREF2
Reference Capacitor (0.01
F Multilayer Ceramic). This external capacitor is used in conjunction with
the on-chip reference. The capacitor should be tied between the pin and AGND.
9–16
AIN1–AIN8
Analog Inputs. Eight analog inputs that can be used as eight single-ended inputs (referenced to AGND)
or four pseudo-differential inputs. Channel configuration is selected by writing to the control register.
Both the positive and negative inputs cannot go below AGND or above AVDD at any time. Also the posi-
tive input cannot go below the negative input. See Table III for channel selection.
17
CAL
Calibration Input. This pin has an internal pull-up current source of 0.15
A. A falling edge on this pin
resets all calibration control logic and initiates a calibration on its rising edge. There is the option of
connecting a 10 nF capacitor from this pin to DGND to allow for an automatic self-calibration on
power-up. This input overrides all other internal operations. If the autocalibration is not required, this
pin should be tied to a logic high.
18
DVDD
Digital Supply Voltage, +5.0 V
± 5%.
19
DGND
Digital Ground. Ground reference point for digital circuitry.
20
DOUT
Serial Data Output. The data output is supplied to this pin as a 16-bit serial word.
21
DIN
Serial Data Input. The data to be written is applied to this pin in serial form (16-bit word). This pin can
act as an input pin or as a I/O pin depending on the serial interface mode the part is in (see Table X).
22
CLKIN
Master clock signal for the device (A Grade: 6 MHz; K Grade: 4 MHz). Sets the conversion and calibra-
tion times.
23
SCLK
Serial Port Clock. Logic Input. The user must provide a serial clock on this input.
24
SYNC
Frame Sync. Logic Input. This pin is level triggered active low and frames the serial clock for the read
and write operations (see Table IX).
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相關代理商/技術參數 |
參數描述 |
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| AD7856ARSZ-REEL7 | 功能描述:IC ADC 14BIT 8CHAN 5V 24SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7856ARZ | 功能描述:IC ADC 14BIT 8CHAN 5V 24SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7856ARZ-REEL7 | 功能描述:IC ADC 14BIT 8CHAN 5V 24SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數:12 采樣率（每秒）:3M 數據接口:- 轉換器數目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數目和類型:- |
| AD7856KR | 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:8 CH. 14-BIT 300 KSPS ADC I.C. - Bulk |
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