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参数资料
| 型号： | AD5390BCP-3-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | 8-/16-Channel, 3 V/5 V, Serial Input, Single- Supply, 12-/14-Bit Voltage Output DACs |
| 中文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 14-BIT DAC, QCC64 |
| 封装： | 9 X 9 MM, MO-220VMMD-4, LFCSP-64 |
| 文件页数： | 38/44页 |
| 文件大小： | 1319K |
| 代理商： | AD5390BCP-3-REEL |
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AD5390/AD5391/AD5392
Digital connections have been omitted for clarity. The AD539x
contains an internal power-on reset circuit with a 10 ms brown-
out time. If the power supply ramp rate exceeds 10 ms, the user
should reset the AD539x as part of the initialization process to
ensure the calibration data is loaded correctly into the device.
Rev. A | Page 38 of 44
AD539x MONITOR FUNCTION
The AD5390 contains a channel monitor function consisting of
a multiplexer addressed via the interface, allowing any channel
output to be routed to this pin for monitoring using an external
ADC. The channel monitor function must be enabled in the
control register before any channels are routed to the
MON_OUT pin.
Table 23 and Table 24 contain the decoding information
required to route any channel on the AD5390, AD5391, and
AD5392 to the MON_OUT pin. Selecting Channel Address 63
three-states the MON_OUT pin. The AD539x family also
contains two monitor input pins called MON_IN1 and
MON_IN2. The user can connect external signals to these
pins, which under software control can be multiplexed to
MON_OUT for monitoring purposes. Figure 42 shows a typical
monitoring circuit implemented using a 12-bit SAR ADC in a
6-lead SOT package. The external reference input is connected
to MON_IN1 to allow it to be easily monitored. The controller
output port selects the channel to be monitored, and the input
port reads the converted data from the ADC.
0
AD5390
AD780/
ADR431
AGND
MON_OUT
MON_IN1
SCLK
SYNC
DIN
REFOUT/REFIN
AV
DD
OUTPUT PORT
INPUT PORT
CONTROLLER
VOUT 0
VOUT 15
AV
DD
DAC_GND SIGNAL GND
AD7476
VIN
CS
SCLK
SDATA
GND
Figure 42. Typical Channel Monitoring Circuit
TOGGLE MODE FUNCTION
The toggle mode function allows an output signal to be
generated 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,
A3–A0 = 1100 specifies a control register write. The toggle
mode function is enabled in groups of eight channels using Bits
CR3 and CR2 in the AD5390/AD5392 control register and
using Bits CR1 and CR0 in the AD5391 control register. (See
the Control Register Write section.) Figure 43 shows a block
diagram of the toggle mode implementation. Each DAC
channel on the AD539x contains an A and a B data register.
Note that the B registers can be loaded only when toggle mode
is enabled.
To configure the AD539x for toggle mode of operation, the
sequence of events is as follows:
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.
The LDAC is used to switch between the A and B registers in
determining the analog output. The first LDAC configures the
output to reflect the data in the A registers. This mode offers
significant advantages, if the user wants to generate a square
wave at the output on all channels as might be required to drive
a liquid-crystal-based, variable optical attenuator. Configuring
the AD5390, for example, the user writes to the control register
and sets CR3 = 1 and CR2 = 1, enabling the two groups of eight
for toggle mode operation. The user must then load data to all
16 A registers and B registers. Toggling the LDAC sets the out-
put values to reflect the data in the A and B registers, and the
frequency of the LDAC determines the frequency of the square
wave output. The first LDAC loads the contents of the A regis-
ters to the DAC registers. Toggle mode is disabled via the
control register; the first LDAC following the disabling of the
toggle mode updates the outputs with the data contained in the
A registers.
THERMAL MONITOR FUNCTION
The AD539x family has 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 AD539x at 5 V leads to a power dissipation of
200 mW/shorted amplifier. With five channels shorted, this
leads to an extra watt of power dissipation. For the 52-lead
LQFP, the
θ
JA
is typically 44°C/W.
The thermal monitor is enabled by the user using CR8 in the
AD5390/AD5392 control register and by CR6 in the AD5391
control register. The output amplifiers on the AD539x 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.
0
14-BIT DAC
VOUT
LDAC
CONTROL INPUT
REDAC
INPUT
REGISTER
INPUT
DATA
DATA
REGISTER
A
DATA
REGISTER
B
A/B
Figure 43. Toggle Mode Function
相关PDF资料 |
PDF描述 |
|---|---|
| AD5391BCP-3-REEL | 8-/16-Channel, 3 V/5 V, Serial Input, Single- Supply, 12-/14-Bit Voltage Output DACs |
| AD5391BST-3 | 8-/16-Channel, 3 V/5 V, Serial Input, Single- Supply, 12-/14-Bit Voltage Output DACs |
| AD5391BST-5 | 8-/16-Channel, 3 V/5 V, Serial Input, Single- Supply, 12-/14-Bit Voltage Output DACs |
| AD5391BST-5-REEL | 8-/16-Channel, 3 V/5 V, Serial Input, Single- Supply, 12-/14-Bit Voltage Output DACs |
| AD5392 | 8-/16-Channel, 3 V/5 V, Serial Input, Single- Supply, 12-/14-Bit Voltage Output DACs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5390BCP-3-REEL7 | 制造商:Analog Devices 功能描述:DAC 16-CH Resistor-String 14-bit 64-Pin LFCSP EP T/R |
| AD5390BCP-5 | 制造商:Analog Devices 功能描述:DAC 16-CH Resistor-String 14-bit 64-Pin LFCSP EP 制造商:Analog Devices 功能描述:14BIT DAC 16CH 5V 5390 LFCSP-64 |
| AD5390BCP-5-REEL | 制造商:Analog Devices 功能描述:DAC 16-CH Resistor-String 14-bit 64-Pin LFCSP EP T/R |
| AD5390BCP-5-REEL7 | 制造商:Analog Devices 功能描述:DAC 16-CH Resistor-String 14-bit 64-Pin LFCSP EP T/R |
| AD5390BCP-U1 | 制造商:Analog Devices 功能描述:DAC HEXADECIMAL RES-STRING 14BIT 64LFCSP - Bulk |
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