参数资料
| 型号： | AD7834AN |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC DAC 14BIT QUAD SRL 28-DIP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 13 |
| 设置时间： | 10µs |
| 位数： | 14 |
| 数据接口： | 串行 |
| 转换器数目： | 4 |
| 电压电源： | 模拟和数字，双 ± |
| 功率耗散（最大）： | 465mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 28-PDIP |
| 包装： | 管件 |
| 输出数目和类型： | 4 电压，单极；4 电压，双极 |
| 采样率（每秒）： | 100k |
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AD7834/AD7835
Rev. D | Page 15 of 28
D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
NOTE: D23 IS THE FIRST BIT TRANSMITTED IN THE SERIAL WORD.
CONTROL BIT TO USE/IGNORE
FOLLOWING 23 BITS OF INFORMATION
CHANNEL ADDRESS MSB, D1
CHANNEL ADDRESS LSB, D2
PACKAGE ADDRESS MSB, PA4
PACKAGE ADDRESS, PA3
PACKAGE ADDRESS, PA2
PACKAGE ADDRESS, PA1
PACKAGE ADDRESS LSB, PA0
LSB, DB0
SECOND LSB, DB1
THIRD LSB, DB2
DB3
DB4
DB5
DB6
DB7
DB8
DB9
DB10
THIRD MSB, DB11
SECOND MSB, DB12
MSB, DB13
SECOND LEADING ZERO
FIRST LEADING ZERO
01006-
018
Figure 18. Bit Assignments for 24-Bit Data Stream of AD7834
When 14-bit transfers are being used, the DAC output voltages,
VOUT1 to VOUT4, can be updated to reflect new data in the DAC
input registers in one of two ways. The first method normally
keeps LDAC high and only pulses LDAC low momentarily to
update all DAC latches simultaneously with the contents of
their respective input registers. The second method ties LDAC
low, and channel updating occurs on a per channel basis after
new data is loaded to an input register.
To avoid the DAC output going to an intermediate value during
a 2-byte transfer, LDAC should not be tied low permanently but
should be held high until the two bytes are written to the input
register. When the selected input register has been loaded with
the two bytes, LDAC should then be pulsed low to update the
DAC latch and, consequently, perform the digital-to-analog
conversion.
In many applications, it may be acceptable to allow the DAC
output to go to an intermediate value during a 2-byte transfer.
In such applications, LDAC can be tied low, thus using one less
control line.
The actual DAC input register that is being written to is deter-
mined by the logic levels present on the device address lines, as
shown in Table 11.
Table 11. AD7835—Address Line Truth Table
A2
A1
A0
DAC Selected
0
DAC 1
0
1
DAC 2
0
1
0
DAC 3
0
1
DAC 4
1
X
All DACs selected
UNIPOLAR CONFIGURATION
Figure 19 shows the AD7834/AD7835 in the unipolar binary
circuit configuration. The VREF(+) input of the DAC is driven by
the
gives the code table for unipolar operation of the AD7834/
AD7835.
+15V
+5V
VOUT
(0V TO 5V)
VCC
2
6
8
5
4
SIGNAL
GND
C1
1nF
AGND
DGND
VDD
VOUT
VREF(+)
VREF(–)
VSS
–15V
1ADDITIONAL PINS OMITTED FOR CLARITY
R1
10k
Ω
AD7834/
AD78351
AD586
SIGNAL
GND
01006-019
Figure 19. Unipolar 5 V Operation
Offset and gain can be adjusted in Figure 19 as follows:
To adjust offset, disconnect the VREF() input from 0 V,
load the DAC with all 0s, and adjust the VREF() voltage
until VOUT = 0 V.
To adjust gain, load the AD7834/AD7835 with all 1s and
adjust R1 until VOUT = 5 V(16383/16384) = 4.999695 V.
Many circuits do not require these offset and gain adjustments.
In these circuits, R1 can be omitted. Pin 5 of the AD586 can be
left open circuit, and Pin 2 (VREF()) of the AD7834/AD7835 is
tied to 0 V.
Binary Number in DAC Latch
MSB
LSB
Analog Output (VOUT)
VREF (16383/16384) V
11
1111
VREF (8192/16384) V
10
0000
VREF (8191/16384) V
01
1111
00
0000
0001
VREF (1/16384) V
00
0000
0 V
1 VREF = VREF(+); VREF() = 0 V for unipolar operation.
2 For VREF(+) = 5 V, 1 LSB = 5 V/214 = 5 V/16384 = 305 μV.
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| AD7834ANZ | 功能描述:IC DAC 14BIT QUAD SRL 28-DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD7834AR | 功能描述:IC DAC 14BIT QUAD SRL 28-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1,000 系列:- 设置时间:1µs 位数:8 数据接口:串行 转换器数目:8 电压电源:双 ± 功率耗散（最大）:941mW 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 W 包装:带卷 (TR) 输出数目和类型:8 电压，单极 采样率（每秒）:* |
| AD7834AR-REEL | 功能描述:IC DAC 14BIT QUAD SRL 28-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:2,400 系列:- 设置时间:- 位数:18 数据接口:串行 转换器数目:3 电压电源:模拟和数字 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:36-TFBGA 供应商设备封装:36-TFBGA 包装:带卷 (TR) 输出数目和类型:* 采样率（每秒）:* |
| AD7834ARZ | 功能描述:IC DAC 14BIT QUAD SRL 28-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD7834ARZ-REEL | 功能描述:IC DAC 14BIT QUAD SERIAL 28SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
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