- 您现在的位置：买卖IC网 > PDF目录1979 > AD5735ACPZ-REEL7 (Analog Devices Inc)IC DAC QUAD VOLT CUR 64LFCSP PDF资料下载
参数资料
| 型号： | AD5735ACPZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/48页 |
| 文件大小： | 0K |
| 描述： | IC DAC QUAD VOLT CUR 64LFCSP |
| 标准包装： | 750 |
| 设置时间： | 18µs |
| 位数： | 12 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 4 |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 64-LFCSP-VQ（9x9） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 4 电流，4 电压 |
| 采样率（每秒）： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
AD5735
Data Sheet
Rev. C | Page 28 of 48
THEORY OF OPERATION
The AD5735 is a quad, precision digital-to-current loop and
voltage output converter designed to meet the requirements of
industrial process control applications. It provides a high precision,
fully integrated, low cost, single-chip solution for generating
current loop and unipolar/bipolar voltage outputs.
The current ranges available are 0 mA to 20 mA, 4 mA to 20 mA,
and 0 mA to 24 mA. The voltage ranges available are 0 V to 5 V,
±5 V, 0 V to 10 V, and ±10 V. The current and voltage outputs
are available on separate pins, and only one output is active at
any one time. The output configuration is user-selectable via the
DAC control register.
On-chip dynamic power control minimizes package power
dissipation in current mode (see the Dynamic Power Control
section).
DAC ARCHITECTURE
The DAC core architecture of the AD5735 consists of two
matched DAC sections. A simplified circuit diagram is shown
in Figure 69. The four MSBs of the 12-bit data-word are decoded
to drive 15 switches, E1 to E15. Each switch connects one of
15 matched resistors either to ground or to the reference buffer
output. The remaining eight bits of the data-word drive Switch S0
to Switch S7 of an 8-bit voltage mode R-2R ladder network.
8-BIT R-2R LADDER
FOUR MSBs DECODED INTO
15 EQUAL SEGMENTS
2R
S0
S1
S7
E1
E2
E15
VOUT
2R
09961-
069
Figure 69. DAC Ladder Structure
The voltage output from the DAC core can be
Buffered and scaled to output a software selectable
unipolar or bipolar voltage range (see Figure 70)
Converted to a current, which is then mirrored to the
supply rail so that the application sees only a current
source output (see Figure 71)
Both the voltage and current outputs are supplied by VBOOST_x.
The current and voltage are output on separate pins and cannot
be output simultaneously. The current and voltage output pins
of a channel can be tied together (see the Voltage and Current
RANGE
SCALING
12-BIT
DAC
VOUT_X SHORT FAULT
+VSENSE_X
–VSENSE_X
VOUT_X
09961-
070
Figure 70. Voltage Output
12-BIT
DAC
VBOOST_x
R2
T2
T1
R3
IOUT_x
RSET
A1
A2
09961-
071
Figure 71. Voltage-to-Current Conversion Circuitry
Voltage Output Amplifier
The voltage output amplifier is capable of generating both
unipolar and bipolar output voltages. It is capable of driving a
load of 1 k in parallel with 1 F (with an external compen-
sation capacitor) to AGND. The source and sink capabilities
of the output amplifier are shown in Figure 22. The slew rate is
1.9 V/s with a full-scale settling time of 18 s max (10 V step).
If remote sensing of the load is not required, connect +VSENSE_x
directly to VOUT_x, and connect VSENSE_x directly to AGND.
VSENSE_x must stay within ±3.0 V of AGND for specified opera-
tion. The difference in voltage between +VSENSE_x and VOUT_x
should be added directly to the headroom requirement.
Driving Large Capacitive Loads
The voltage output amplifier is capable of driving capacitive
loads of up to 2 F with the addition of a 220 pF, nonpolarized
compensation capacitor on each channel. The 220 pF capacitor
is connected between the COMPLV_x pin and the VOUT_x pin.
Care should be taken to choose an appropriate value of com-
pensation capacitor. This capacitor, while allowing the AD5735
to drive higher capacitive loads and reduce overshoot, increases
the settling time of the part and, therefore, affects the bandwidth
of the system. Without the compensation capacitor, capacitive
loads of up to 10 nF can be driven.
Reference Buffers
The AD5735 can operate with either an external or internal
reference. The reference input requires a 5 V reference for
specified performance. This input voltage is then buffered
before it is applied to the DAC.
相关PDF资料 |
PDF描述 |
|---|---|
| AD5737ACPZ | IC DAC QUAD 12BIT CUR 64-LFCSP |
| AD573JD | IC ADC 10BIT SAR REG 20-CDIP |
| AD5744RCSUZ-REEL7 | IC DAC QUAD 14BIT 1LSB 32TQFP |
| AD574AKPZ-REEL | IC ADC 12BIT W/REF/CLK 28-PLCC |
| AD5752AREZ | IC DAC DUAL 16BIT SERIAL 24TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5737 | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad Channel, 16-Bit, Serial Input, 4-20mA Output DAC, Dynamic Power Control, HART Connectivity |
| AD5737_12 | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad-Channel, 12-Bit, Serial Input, 4 mA to 20 mA Output |
| AD5737ACPZ | 功能描述:IC DAC QUAD 12BIT CUR 64-LFCSP 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 |
| AD5737ACPZ-RL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad-Channel, 12-Bit, Serial Input, 4 mA to 20 mA Output |
| AD5737X | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad Channel, 16-Bit, Serial Input, 4-20mA Output DAC, Dynamic Power Control, HART Connectivity |
发布紧急采购，3分钟左右您将得到回复。