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参数资料
| 型号： | AD5381BST-5-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | 40-Channel, 3 V/5 V, Single-Supply, 12-Bit, Voltage Output DAC |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 6 us SETTLING TIME, 12-BIT DAC, PQFP100 |
| 封装： | 14 X 14 MM, MS-026-BED, LQFP-100 |
| 文件页数： | 34/36页 |
| 文件大小： | 1200K |
| 代理商： | AD5381BST-5-REEL |
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AD5381
AD5381 MONITOR FUNCTION
The AD5381 contains a channel monitor function that consists
of a multiplexer addressed via the interface, allowing any chan-
nel output to be routed to this pin for monitoring using an
external ADC. In channel monitor mode, VOUT 39 becomes
the MON_OUT pin, to which all monitored signals are routed.
The channel monitor function must be enabled in the control
register before any channels are routed to MON_OUT. Table 18
contains the decoding information required to route any chan-
nel to MON_OUT. Selecting Channel Address 63 three-states
MON_OUT. Figure 41 shows a typical monitoring circuit im-
plemented using a 12-bit SAR ADC in a 6-lead SOT-23 package.
The controller output port selects the channel to be monitored,
and the input port reads the converted data from the ADC.
Rev. A | Page 34 of 36
AD7476
V
IN
GND
SDATA
CS
SCLK
V
DD
VOUT39/MON_OUT
AGND
DIN
SYNC
SCLK
DAC_GND SIGNAL_GND
V
OUT
0
V
OUT
38
AVDD
AD5381
OUTPUT PORT
INPUT PORT
CONTROLLER
0
Figure 41. Typical Channel Monitoring Circuit
TOGGLE MODE FUNCTION
The toggle mode function allows an output signal to be gener-
ated using the LDAC control signal that switches between two
DAC data registers. This function is configured using the SFR
control register as follows. A write with REG1 = REG0 = 0 and
A5–A0 = 001100 specifies a control register write. The toggle
mode function is enabled in groups of eight channels using Bits
CR4 to CR0 in the control register. See the AD5381 control
register description. Figure 42 shows a block diagram of toggle
mode implementation. Each of the 40 DAC channels on the
AD5381 contain an A and B data register. Note that B registers
can only be loaded when toggle mode is enabled. The sequence
of events when configuring the AD5381 for toggle mode is
1.
Enable toggle mode for the required channels via the
control register.
2.
Load data to A registers.
3.
Load data to B registers.
4.
Apply LDAC.
LDAC is used to switch between the A and B registers in
determining the analog output. The first LDAC configures the
output to reflect data in the A registers. This mode offers signif-
icant advantages if the user wants to generate a square wave at
the output of all 40 channels, as might be required to drive a
liquid crystal based variable optical attenuator. In this case, the
user writes to the control register and enables the toggle func-
tion by setting CR4 to CR2 = 0, thus enabling the five groups of
eight for toggle mode operation. The user must then load data
to all 40 A and B registers. Toggling LDAC sets the output
values to reflect the data in the A and B registers. The LDAC’s
frequency determines the frequency of the square wave output.
Toggle mode is disabled via the control register. The first LDAC
following the disabling of the toggle mode will update the
outputs with the data contained in the A registers.
THERMAL MONITOR FUNCTION
The AD5381 contains a temperature shutdown function to
protect the chip in case multiple outputs are shorted. The short
circuit current of each output amplifier is typically 40 mA.
Operating the AD5381 at 5 V leads to a power dissipation of
200 mW per shorted amplifier. With five channels shorted, this
leads to an extra watt of power dissipation. For the 100-lead
LQFP, the θ
JA
is typically 44°C/W.
The thermal monitor is enabled by the user via CR6 in the
control register. The output amplifiers on the AD5381 are
automatically powered down if the die temperature exceeds
approximately 130°C. After a thermal shutdown has occurred,
the user can re-enable the part by executing a soft power-up if
the temperature has dropped below 130°C or by turning off the
thermal monitor function via the control register.
12-BIT DAC
DAC
REGISTER
INPUT
DATA
INPUT
REGISTER
DATA
REGISTER
B
DATA
REGISTER
A
A/B
V
OUT
LDAC
CONTROL INPUT
0
Figure 42. Toggle Mode Function
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相关代理商/技术参数 |
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| AD5381BSTZ-3 | 功能描述:IC DAC 12BIT 40CHAN 3V 100LQFP 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 |
| AD5381BSTZ-3-REEL | 功能描述:IC DAC 12BIT 40CH 3V 100-LQFP 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: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）:* |
| AD5381BSTZ-5 | 功能描述:IC DAC 12BIT 40CH 5V 100-LQFP 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: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）:* |
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| AD5382BST-3 | 制造商:Analog Devices 功能描述:DAC 32-CH Resistor-String 14-bit 100-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:32/40-CHANNEL 3V/5V SINGLE SUPPLY 12/14-BIT VOUT DAC - Bulk |
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