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参数资料
| 型号： | AD7858BRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 30/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CHAN SRL 24SOIC |
| 标准包装： | 1,000 |
| 位数： | 12 |
| 采样率（每秒）： | 200k |
| 数据接口： | 8051，QSPI?，串行，SPI? µP |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 33mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极；4 个伪差分，单极 |
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AD7858/AD7858L
REV. B
–7–
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 AD7858/
AD7858L 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 2.5 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, +3.0 V to +5.5 V.
6
AGND
Analog Ground. Ground reference for track/hold, reference, and DAC.
7CREF1
Reference Capacitor (0.1
F Multilayer Ceramic). 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 Ceramic Disc). 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 Logic 0 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, +3.0 V to +5.5 V.
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 (4 MHz AD7858, 1.8 MHz AD7858L). Sets the conversion and cali-
bration 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7858L | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC |
| AD7858LAN | 制造商:Analog Devices 功能描述: |
| AD7858LAN3 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC |
| AD7858LANZ | 功能描述:IC ADC 12BIT 8CHAN SRL 24DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
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