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参数资料
| 型号： | AD7859LASZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 26/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CHAN LP 44-MQFP |
| 标准包装： | 800 |
| 位数： | 12 |
| 采样率（每秒）： | 100k |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 30mW |
| 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： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个伪差分，单极；4 个伪差分，双极 |
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AD7859/AD7859L
REV. A
–7–
PIN FUNCTION DESCRIPTION
Mnemonic
Description
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.
RD
Read Input. Active low logic input. Used in conjunction with CS to read from internal registers.
WR
Write Input. Active low logic input. Used in conjunction with CS to write to internal registers.
CS
Chip Select Input. Active low logic input. The device is selected when this input is active.
REFIN/
Reference Input/Output. This pin is connected to the internal reference through a series resistor and is the
REFOUT
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, then the CREF1 pin should also be tied to AVDD.
AVDD
Analog Supply Voltage, +3.0 V to +5.5 V.
AGND
Analog Ground. Ground reference for track/hold, reference and DAC.
DVDD
Digital Supply Voltage, +3.0 V to +5.5 V.
DGND
Digital Ground. Ground reference point for digital circuitry.
CREF1
Reference Capacitor (0.1
F multilayer ceramic). This external capacitor is used as a charge source for the inter-
nal DAC. The capacitor should be tied between the pin and AGND.
CREF2
Reference Capacitor (0.01
F ceramic disc). This external capacitor is used in conjunction with the on-chip refer-
ence. The capacitor should be tied between the pin and AGND.
AIN1–AIN8
Analog Inputs. Eight analog inputs which 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. None of the inputs
can go below AGND or above AVDD at any time. See Table III for channel selection.
W/B
Word/Byte input. When this input is at a logic 1, data is transferred to and from the AD7859/AD7859L in 16-bit
words on pins DB0 to DB15. When this pin is at a Logic 0, byte transfer mode is enabled. Data is transferred on
pins DB0 to DB7 and pin DB8/HBEN assumes its HBEN functionality.
DB0–DB7
Data Bits 0 to 7. Three state data I/O pins that are controlled by CS, RD and WR. Data output is straight binary
(unipolar mode) or twos complement (bipolar mode).
DB8/HBEN
Data Bit 8/High Byte Enable. When W/B is high, this pin acts as Data Bit 7, a three state data I/O pin that is con-
trolled by CS, RD and WR. When W/B is low, this pin acts as the High Byte Enable pin. When HBEN is low,
then the low byte of data being written to or read from the AD7859/AD7859L is on DB0 to DB7. When HBEN
is high, then the high byte of data being written to or read from the AD7859/AD7859L is on DB0 to DB7.
DB9–DB15
Data Bits 9 to 15. Three state data I/O pins that are controlled by CS, RD and WR. Data output is straight bi-
nary (unipolar mode) or twos complement (bipolar mode).
CLKIN
Master Clock Signal for the device (4 MHz for AD7859, 1.8 MHz for AD7859L). Sets the conversion and calibra-
tion times.
CAL
Calibration Input. A logic 0 in this pin resets all logic. A rising edge on this pin initiates a calibration. This input
overrides all other internal operations.
BUSY
Busy Output. The busy output is triggered high when a conversion or a calibration is initiated, and remains high
until the conversion or calibration is completed.
SLEEP
Sleep Input. This pin is used in conjunction with the PGMT0 and PGMT1 bits in the control register to deter-
mine the power-down mode. Please see the “Power-Down Options” section for details.
NC
No connect pins. These pins should be left unconnected.
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