参数资料
| 型号： | AD5552BRZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC DAC 14BIT SERIAL IN 14SOIC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 56 |
| 设置时间： | 1µs |
| 位数： | 14 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 6.05mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 管件 |
| 输出数目和类型： | 1 电压，单极；1 电压，双极 |
| 采样率（每秒）： | 1M |
AD5551/AD5552
Rev. A | Page 12 of 16
Assuming a perfect reference, the worst-case output voltage
may be calculated from the following equation:
()
INL
V
D
V
ZSE
GE
REF
UNI
OUT
+
×
=
14
2
where:
VOUT–UNI is the unipolar mode worst-case output.
D is the decimal code loaded to the DAC.
VREF is the reference voltage applied to part.
VGE is the gain error in volts.
VZSE is the zero-scale error in volts.
INL is the integral nonlinearity in volts.
BIPOLAR OUTPUT OPERATION
With the aid of an external op amp, the AD5552 may be confi-
gured to provide a bipolar voltage output. A typical circuit of
such operation is shown in Figure 24. The matched bipolar
offset resistors RFB and RINV are connected to an external op amp
to achieve this bipolar output swing where RFB = RINV = 28 kΩ.
Table 7 shows the transfer function for this output operating
mode. Also provided on the AD5552 are a set of Kelvin
connections to the analog ground inputs.
+5V
–5V
VOUT
INV
RFB
VREFF
AGNDF AGNDS
VDD
DIN
SCLK
CS
AD5552
VREFS
DGND
+
0.1F
10F
UNIPOLAR
OUTPUT
EXTERNAL
OP AMP
2.5V
5V
LDAC
SERIAL
INTERFACE
RINV
RFB
01
94
3-
02
4
Figure 24. Bipolar Output (AD5552 Only)
Table 7. Bipolar Code Table
DAC Latch Contents
MSB
LSB
Analog Output
11 1111 1111 1111
+VREF × (8191/8192)
10 0000 0000 0000
+VREF × (1/8192)
00 0000 0000 0001
0 V
00 0000 0000 0000
VREF × (1/8192)
00 0000 0000 0000
VREF × (8191/8192) = –VREF
Assuming a perfect reference, the worst-case bipolar output
voltage may be calculated from the following equation.
A
RD
V
RD
V
REF
OS
UNI
OUT
BIP
OUT
/
)
2
(
1
)
1
(
)
2
)(
[(
+
+
=
where:
VOS is the external op amp input offset voltage.
RD is the RFB and RIN resistor matching error, unitless.
A is the op amp open-loop gain.
OUTPUT AMPLIFIER SELECTION
For bipolar mode, use a precision amplifier, supplied from a
dual power supply. This provides the ±VREF output. In a single-
supply application, selection of a suitable op amp may be more
difficult as the output swing of the amplifier does not usually
include the negative rail, in this case AGND. This can result in
some degradation of the specified performance unless the
application does not use codes near zero.
The selected op amp needs to have a very low-offset voltage,
(the DAC LSB is 152 μV with a 2.5 V reference), to eliminate
the need for output offset trims. Input bias current should also
be very low as the bias current multiplied by the DAC output
impedance (approximately 6K) adds to the zero-code error.
Rail-to-rail input and output performance is required. For fast
settling, the slew rate of the op amp should not impede the
settling time of the DAC. Output impedance of the DAC is
constant and code-independent, but to minimize gain errors,
the input impedance of the output amplifier should be as high
as possible. The amplifier should also have a 3 dB bandwidth of
1 MHz or greater. The amplifier adds another time constant to
the system, therefore increasing the settling time of the output.
A higher 3 dB amplifier bandwidth results in a faster effective
settling time of the combined DAC and amplifier.
FORCE SENSE BUFFER AMPLIFIER SELECTION
These amplifiers can be single-supply or dual supplies, low
noise amplifiers. A low-output impedance at high frequencies
is preferred as they need to be able to handle dynamic currents
of up to ±20 mA.
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