参数资料
| 型号： | LTC2758BILX#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/24页 |
| 文件大小： | 0K |
| 描述： | IC DAC 18BIT SPI/SRL 48-LQFP |
| 标准包装： | 250 |
| 系列： | SoftSpan™ |
| 设置时间： | 2.1µs |
| 位数： | 18 |
| 数据接口： | 串行，SPI? |
| 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-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 管件 |
| 输出数目和类型： | 2 电流，单极；4 电流，双极 |
| 配用： | DC1684A-A-ND - BOARD DAC LTC2758 |
LTC2758
9
2758fa
For more information www.linear.com/LTC2758
PIN FUNCTIONS
S2 (Pin 25): Span Bit 2 Input. In Manual Span mode (M-
SPAN tied to VDD), Pins S0, S1 and S2 are pin-strapped to
select a single fixed output range for all DACs. These pins
shouldbetiedtoeitherGNDorVDDeveniftheyareunused.
LDAC (Pin 26): Asynchronous DAC Load Input. When
LDAC is a logic low, all DACs are updated (CS/LD must
be high).
IOUT2BF, IOUT2BS (Pins 28, 29): DAC B Current Output
Complement Force and Sense Pins. Tie to ground via a
clean, low-impedance path. These pins may be used with
a precision ground buffer amp as a Kelvin sensing pair
(see the Applications Information section).
RINB (Pins 31, 32): Input Resistor for the DAC B External
Reference Inverting Amplifier. The 20k input resistor is
connected internally from RINB to RCOMB. For normal op-
eration tie RINB to the external positive reference voltage
(seeTypicalApplication).Eitherorbothoftheseprecision-
matched resistor sets (each set comprising RINX, RCOMX
and REFX) may be used to invert positive references to
provide the negative voltages needed by the DACs. Typi-
cally 5V; accepts up to ±15V. Pins 31 and 32 are internally
shorted together.
GEADJB (Pin 33): Gain Adjust Pin for DAC B. This control
pin can be used to null gain error or to compensate for
reference errors. The gain change expressed in LSB is
the same for any output range. See System Offset and
Gain Adjustments in the Operation section. Tie to ground
if not used.
RCOMB (Pin 34): Virtual Ground Point for the DAC B Ref-
erence Amplifier Inverting Resistors. The 20k reference
inverting resistors are connected internally from RINB to
RCOMB and from RCOMB to REFB, respectively (see Block
Diagram). For normal operation tie RCOMB to the negative
input of the external reference inverting amplifier (see
Typical Application).
REFB (Pins 35, 36): Feedback Resistor for the DAC B
Reference Inverting Amplifier, and Reference Input for
DAC B. The 20k feedback resistor is connected internally
from REFB to RCOMB. For normal operation tie this pin to
the output of the DAC B reference inverting amplifier (see
Typical Application). Typically –5V; accepts up to ±15V.
Pins 35 and 36 are internally shorted together.
ROFSB (Pins 37, 38): Bipolar Offset Resistor for DAC B.
These pins provide the translation of the output voltage
range for bipolar spans. Accepts up to ±15V; for normal
operation tie to the positive reference voltage at RINB (Pins
31, 32). Pins 37 and 38 are internally shorted together.
RFBB (Pins 39, 40): DAC B Feedback Resistor. For normal
operation tie to the output of the I/V converter amplifier for
DAC B (see Typical Application). The DAC output current
from IOUT1B flows through the feedback resistor to the
RFBB pins. Pins 39 and 40 are internally shorted together.
IOUT1B (Pin 41): 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 amplifier for DAC B (see Typical Application).
VOSADJB (Pin 42): DAC B Offset Adjust Pin. This voltage-
control pin can be used to null unipolar offset or bipolar
zero error. The offset change expressed in LSB is the same
for any output range. See System Offset and Gain Adjust-
ments in the Operation section. Tie to ground if not used.
VOSADJA (Pin 43): DAC A Offset Adjust Pin. This voltage-
control pin can be used to null unipolar offset or bipolar
zero error. The offset change expressed in LSB is the same
for any output range. See System Offset and Gain Adjust-
ments in the Operation section. Tie to ground if not used.
IOUT1A (Pin 44): 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 amplifier for DAC A (see Typical Application).
RFBA (Pins 45, 46): DAC A Feedback Resistor. For normal
operation tie to the output of the I/V converter amplifier for
DAC A (see Typical Application). The DAC output current
from IOUT1A flows through the feedback resistor to the
RFBA pins. Pins 45 and 46 are internally shorted together.
ROFSA (Pins 47, 48): Bipolar Offset Resistor 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 RINA
(Pins 5, 6). Pins 47 and 48 are internally shorted together.
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