- 您现在的位置：买卖IC网 > PDF目录10147 > AD7899BR-1 (Analog Devices Inc)IC ADC 14BIT 400KSPS 5V 28-SOIC PDF资料下载
参数资料
| 型号： | AD7899BR-1 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 400KSPS 5V 28-SOIC |
| 标准包装： | 27 |
| 位数： | 14 |
| 采样率（每秒）： | 400k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 125mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | EVAL-AD7899CBZ-ND - BOARD EVAL FOR AD7899 |
REV. A
AD7899
–9–
AD7899-1
VINA
TRACK/HOLD
TO ADC
REFERENCE
CIRCUITRY
TO INTERNAL
COMPARATOR
R4
R1
R2
6k
2.5V
REFERENCE
R3
GND
VINB
VREF
Figure 2. AD7899-1 Analog Input Structure
For the AD7899-1, R1 = 4 k
, R2 = 16 k, R3 = 16 k and
R4 = 8 k
. The resistor input stage is followed by the high
input impedance stage of the track/hold amplifier.
The designed code transitions take place midway between suc-
cessive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs
etc.) LSB size is given by the formula, 1 LSB = FSR/16384. For
the
±5 V range, 1 LSB = 10 V/16384 = 610.4 V. For the ±10 V
range, 1 LSB = 20 V/16384 = 1.22 mV. Output coding is
two’s complement binary with 1 LSB = FSR/16384. The ideal
input/output transfer function for the AD7899-1 is shown in
Table I.
Table I. Ideal Input/Output Code Table for the AD7899-1
Digital Output
Analog Input
1
Code Transition
+FSR/2 – 3/2 LSB
2
011 . . . 110 to 011 . . . 111
+FSR/2 – 5/2 LSB
011 . . . 101 to 011 . . . 110
+FSR/2 – 7/2 LSB
011 . . . 100 to 011 . . . 101
GND + 3/2 LSB
000 . . . 001 to 000 . . . 010
GND + 1/2 LSB
000 . . . 000 to 000 . . . 001
GND – 1/2 LSB
111 . . . 111 to 000 . . . 000
GND – 3/2 LSB
111 . . . 110 to 111 . . . 111
–FSR/2 + 5/2 LSB
100 . . . 010 to 100 . . . 011
–FSR/2 + 3/2 LSB
100 . . . 001 to 100 . . . 010
–FSR/2 + 1/2 LSB
100 . . . 000 to 100 . . . 001
NOTES
1FSR is full-scale range and is 20 V for the
±10 V range and 10 V for the ±5 V
range, with VREF = 2.5 V.
21 LSB = FSR/16384 = 1.22 mV (
±10 V – AD7899-1) and 610.4 V (±5 V –
AD7899-1) with VREF = 2.5 V.
AD7899-2
Figure 3 shows the analog input section of the AD7899-2. Each
input can be configured for 0 V to 5 V operation or 0 V to 2.5 V
operation. For 0 V to 5 V operation, the VINB input is tied to
GND and the input voltage is applied to the VINA input. For
0 V to 2.5 V operation, the VINA and VINB inputs are tied together
and the input voltage is applied to both. The VINA and VINB
inputs are symmetrical and fully interchangeable.
For the AD7899-2, R1 = 4 k
and R2 = 4 k. Once again, the
designed code transitions occur on successive integer LSB values.
Output coding is straight (natural) binary with 1 LSB = FSR/
16384 = 2.5 V/16384 = 0.153 mV, and 5 V/16384 = 0.305 mV,
for the 0 to 2.5 V and the 0 to 5 V options respectively. Table
II shows the ideal input and output transfer function for the
AD7899-2.
AD7899-2
VINA
TRACK/HOLD
TO ADC
REFERENCE
CIRCUITRY
TO INTERNAL
COMPARATOR
R1
6k
2.5V
REFERENCE
R2
VINB
VREF
Figure 3. AD7899-2 Analog Input Structure
Table II. Ideal Input/Output Code Table for the AD7899-2
Digital Output
Analog Input
1
Code Transition
+FSR – 3/2 LSB
2
111 . . . 110 to 111 . . . 111
+FSR – 5/2 LSB
111 . . . 101 to 111 . . . 110
+FSR – 7/2 LSB
111 . . . 100 to 111 . . . 101
GND + 5/2 LSB
000 . . . 010 to 000 . . . 011
GND + 3/2 LSB
000 . . . 001 to 000 . . . 010
GND + 1/2 LSB
000 . . . 000 to 000 . . . 001
NOTES
1FSR is Full-Scale Range and is 0 to 2.5 V and 0 to 5 V for AD7899-2 with V
REF
= 2.5 V.
21 LSB = FSR/16384 and is 0.153 mV (0 to 2.5 V) and 0.305 mV (0 to 5 V) for
AD7899-2 with VREF = 2.5 V.
相关PDF资料 |
PDF描述 |
|---|---|
| MS27468T9F35PA | CONN RCPT 6POS JAM NUT W/PINS |
| VE-242-IU-F2 | CONVERTER MOD DC/DC 15V 200W |
| VE-B3Y-IV-B1 | CONVERTER MOD DC/DC 3.3V 99W |
| VE-241-IU-F4 | CONVERTER MOD DC/DC 12V 200W |
| MS3106F20-29SZ | CONN PLUG 17POS STRAIGHT W/SCKT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7899BR-1REEL | 制造商:Analog Devices 功能描述:ADC SGL SAR 400KSPS 14BIT PARALLEL 28SOIC W - Tape and Reel |
| AD7899BR-1REEL7 | 功能描述:IC ADC 14BIT 400KSPS 5V 28-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD7899BR-3 | 制造商:Rochester Electronics LLC 功能描述:14-BIT BIPOLAR INPUT SINGLE SUPPLY ADC - Bulk 制造商:Analog Devices 功能描述: |
| AD7899BR-3REEL | 制造商:Analog Devices 功能描述:ADC SGL SAR 400KSPS 14BIT PARALLEL 28SOIC W - Tape and Reel |
| AD7899BR-3REEL7 | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: |
发布紧急采购，3分钟左右您将得到回复。