参数资料
| 型号： | AD7305BR-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT QUAD R-R 20-SOIC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1,000 |
| 设置时间： | 1µs |
| 位数： | 8 |
| 数据接口： | 并联 |
| 转换器数目： | 4 |
| 电压电源： | 双 ± |
| 功率耗散（最大）： | 60mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 4 电压，单极；4 电压，双极 |
| 采样率（每秒）： | 1M |
AD7304/AD7305
Rev. C | Page 14 of 20
CIRCUIT OPERATION
The AD7304/AD7305 are 4-channel, 8-bit, voltage output
DACs, differing primarily in digital logic interface and number
of reference inputs. Both parts share the same internal DAC
design and true rail-to-rail output buffers. The AD7304 contains
four independent multiplying reference inputs, while the
AD7305 has one common reference input. The AD7304 uses a
3-wire SPI-compatible serial data interface, while the AD7305
offers an 8-bit parallel data interface.
DAC SECTION
Each part contains four voltage-switched R-2R ladder DACs.
Figure 33 shows a typical equivalent DAC. These DACs are
designed to operate both single-supply or dual-supply,
depending on whether the user supplies a negative voltage on
the VSS pin. In a single-supply application, the VSS is tied to
ground. In either mode, the DAC output voltage is determined
by the VREF input voltage and the digital data (D) loaded into
the corresponding DAC register according to Equation 1.
VOUT = VREF D/256
(1)
Note that the output full-scale polarity is the same as the VREF
polarity for dc reference voltages.
VREF
DB7
2R
VDD
VSS
VOUT
R
2R
DB6
2R
DB0
2R
01114-033
Figure 33. Typical Equivalent DAC Channel
These DACs are also designed to accommodate ac reference
input signals. As long as the ac signals are maintained between
VSS < VREF < VDD, the user can expect 50 kHz of full power,
multiplying bandwidth performance. In order to use negative
input reference voltages, the VSS pin must be biased with a
negative voltage of equal or greater magnitude than the
reference voltage.
The reference inputs are code dependent, exhibiting worst-case
minimum resistance values specified in the parametric specifi-
cation table. The DAC outputs VOUTA, VOUTB, VOUTC, and VOUTD
are each capable of driving 2 k loads in parallel with up to 500 pF
loads. Output sink current and source current are shown in
Figure 10 and Figure 11, respectively. The output slew rate is
nominally 3.6 V/s while operating from ±5 V supplies. The
low output impedance of the buffers minimizes crosstalk
between analog input channels. At 100 kHz, 65 dB of channel-
to-channel isolation exists (Figure 26). Output voltage noise is
plotted in Figure 23. In order to maintain good analog perform-
ance, power supply bypassing of 0.01 F in parallel with 1 F is
recommended. The true rail-to-rail capability of the AD7304/AD7305
allows the user to connect the reference inputs directly to the
conditions, clean power supply voltages (low ripple, avoid
switching supplies) appropriate for the application should be
used.
VDD
VSS
VOUTX
120k
Q1
Q2
01114-034
Figure 34. Equivalent DAC Amplifier Output Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7305BR-REEL7 | 功能描述:INTEGRATED CIRCUIT 制造商:analog devices inc. 系列:* 包装:带卷（TR） 零件状态:最後搶購 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商器件封装:20-SOIC 标准包装:1 |
| AD7305BRU | 功能描述:IC DAC 8BIT QUAD R-R 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| AD7305BRU-REEL7 | 功能描述:IC DAC 8BIT QUAD R-R 20-TSSOP 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:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
| AD7305BRUZ | 功能描述:IC DAC 8BIT QUAD R-R 20-TSSOP 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:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 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:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
| AD7305BRUZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, Rail-to-Rail Quad, 8-Bit DAC |
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