参数资料
| 型号： | LTC1599AIG#TR |
| 厂商： | Linear Technology |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT PARALLEL IN 24SSOP |
| 标准包装： | 1,800 |
| 设置时间： | 1µs |
| 位数： | 16 |
| 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： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 3 电流，单极；3 电流，双极 |
| 采样率（每秒）： | * |
12
LTC1599
sn1599 1599fs
APPLICATIONS INFORMATION
WU
U
Precision Voltage Reference Considerations
Much in the same way selecting an operational amplifier
for use with the LTC1599 is critical to the performance of
the system, selecting a precision voltage reference also
requires due diligence. As shown in the section describing
the basic operation of the LTC1599, the output voltage of
the DAC circuit is directly affected by the voltage reference;
thus, any voltage reference error will appear as a DAC
output voltage error.
There are three primary error sources to consider when
selecting a precision voltage reference for 16-bit applica-
tions: output voltage initial tolerance, output voltage tem-
perature coefficient and output voltage noise.
Initial reference output voltage tolerance, if uncorrected,
generates a full-scale error term. Choosing a reference
with low output voltage initial tolerance, like the LT1236
(±0.05%), minimizes the gain error caused by the refer-
ence; however, a calibration sequence that corrects for
system zero- and full-scale error is always recommended.
1599 F03
Bipolar Offset Binary Code Table
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
VREF (32,767/32,768)
VREF (1/32,768)
0V
–VREF (1/32,768)
–VREF
LSB
1111 1111 1111
0000 0000 0001
0000 0000 0000
1111 1111 1111
0000 0000 0000
ANALOG OUTPUT
VOUT
MSB
1111
1000
0111
0000
VCC
LTC1599
RFB
ROFS
5V
43
20
8
19
R1
RCOM
2
R2
1
REF
5
6
0.1F
7
IOUT1
15pF
VOUT
–VREF TO VREF
IOUT2F
9
IOUT2S
DGND
–
+
1/2 LT1112
14 TO 18,
21 TO 23
13
MLBYTE
VREF
–
+
1/2 LT1112
16-BIT DAC
R1
R2
8
DATA
INPUTS
LD
12
11
24
10
WR
CLR
CLVL
CLR
CLVL
3
1
2
6
7
5
Figure 3. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
A reference’s output voltage temperature coefficient af-
fects not only the full-scale error, but can also affect the
circuit’s INL and DNL performance. If a reference is
chosen with a loose output voltage temperature coeffi-
cient, then the DAC output voltage along its transfer
characteristic will be very dependent on ambient condi-
tions. Minimizing the error due to reference temperature
coefficient can be achieved by choosing a precision refer-
ence with a low output voltage temperature coefficient
and/or tightly controlling the ambient temperature of the
circuit to minimize temperature gradients.
As precision DAC applications move to 16-bit and higher
performance, reference output voltage noise may contrib-
ute a dominant share of the system’s noise floor. This in
turn can degrade system dynamic range and signal-to-
noise ratio. Care should be exercised in selecting a voltage
reference with as low an output noise voltage as practical
for the system resolution desired. Precision voltage refer-
ences, like the LT1236, produce low output noise in the
0.1Hz to 10Hz region, well below the 16-bit LSB level in 5V
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