参数资料
| 型号： | LTC2753IUK-12#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT DUAL 48-QFN |
| 标准包装： | 2,000 |
| 系列： | SoftSpan™ |
| 设置时间： | 2µs |
| 位数： | 12 |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN-EP（7x7） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 4 电流，单极；4 电流，双极 |
| 采样率（每秒）： | * |
LTC2753
11
2753f
PIN FUNCTIONS
output the contents of the selected register (see Table
1). For single-span operation, readback of the span I/O
pins is disabled.
UPD (Pin 36): Update and Buffer Select Pin. When READ
is held low and UPD is asserted high, the contents of the
addressed DAC’s input registers (both data and span) are
copied into their respective DAC registers. The output of the
DAC is updated, reecting the new DAC register values.
When READ is held high, the update function is disabled
and the UPD pin functions as a buffer selector—logic low
to select the input register, high to select the DAC register.
See Readback in the Operation section.
WR (Pin 37): Active Low Write Pin. A Write operation cop-
ies the data present on the data or span I/O pins (D0-D15
or S0-S2, respectively) into the associated input register.
When READ is high, the Write function is disabled.
S1 (Pin 38): Span I/O Bit 1. Pins S0, S1 and S2 are used
to program and to read back the output ranges of the
DACs.
REFB (Pin 39): Reference Input for DAC B. The impedance
looking into this pin is 10k to ground. For normal opera-
tion tie to the output of the reference inverting amplier.
Typically –5V; accepts up to ±15V.
ROFSB (Pin 40): Bipolar Offset Network for DAC B. This
pin provides the translation of the output voltage range for
bipolar spans. Accepts up to ±15V; for normal operation
tie to the positive reference voltage at RIN (Pin 2). The
impedance looking into this pin is 20k to ground.
RFBB (Pin 41): DAC B Feedback Resistor. For normal
operation tie to the output of the I/V converter amplier
for DAC B (see Typical Applications). The DAC output
current from IOUT1B ows through the feedback resistor
to the RFBB pin. The impedance looking into this pin is
10k to ground.
IOUT1B (Pin 42): DAC B Current Output. This pin is a virtual
ground when the DAC is operating and should reside at
0V. For normal operation tie to the negative input of the I/V
converter amplier for DAC B (see Typical Applications).
RVOSB (Pin 43): DAC B Offset Adjust. Nominal input range
is ±5V. The impedance looking into this pin is 1M to ground.
If not used, tie RVOSB to ground.
RVOSA (Pin 44): DAC A Offset Adjust. Nominal input range
is ±5V. The impedance looking into this pin is 1M to ground.
If not used, tie RVOSA to ground.
IOUT1A (Pin 45): DAC A Current Output. This pin is a virtual
ground when the DAC is operating and should reside at
0V. For normal operation tie to the negative input of the I/V
converter amplier for DAC A (see Typical Applications).
RFBA (Pin 46): DAC A Feedback Resistor. For normal
operation tie to the output of the I/V converter amplier
for DAC A (see Typical Applications). The DAC output
current from IOUT1A ows through the feedback resistor
to the RFBA pin. The impedance looking into this pin is
10k to ground.
ROFSA (Pin 47): Bipolar Offset Network for DAC A. This
pin provides the translation of the output voltage range for
bipolar spans. Accepts up to ±15V; for normal operation
tie to the positive reference voltage at RIN (Pin 2). The
impedance looking into this pin is 20k to ground.
REFA (Pin 48): Reference Input for DAC A, and connec-
tion for internal reference inverting resistor R2. The 20k
resistor R2 is connected internally from RCOM to REFA. For
normal operation tie this pin to the output of the reference
inverting amplier (see Typical Applications). Typically –5V;
accepts up to ±15V. The impedance looking into this pin
is 10k to ground (RIN and RCOM oating).
Exposed Pad (Pin 49): Ground. The Exposed Pad must
be soldered to the PCB.
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