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參數(shù)資料
| 型號： | DC1112A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DAC LTC2755-16 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC1112A Design File DC1112A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuikEval™, SoftSpan™ |
| DAC 的數(shù)量： | 4 |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 設(shè)置時間： | 2µs |
| DAC 型： | 電流 |
| 工作溫度： | 0°C ~ 70°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTC2755-16 |
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LTC2755
10
2755f
PIN FUNCTIONS
RVOSD (Pin 25): DAC D Offset Adjust. Nominal input range
is ±5V. The impedance looking into this pin is 1M to ground.
If not used, tie RVOSD to ground.
RVOSC (Pin 26): DAC C Offset Adjust. Nominal input range
is ±5V. The impedance looking into this pin is 1M to ground.
If not used, tie RVOSC to ground.
IOUT1C (Pin 27): DAC C 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 C (see Typical Applications).
RFBC (Pin 28): DAC C Feedback Resistor. For normal
operation tie to the output of the I/V converter amplier
for DAC C (see Typical Applications). The DAC output
current from IOUT1C ows through the feedback resistor
to the RFBC pin. The impedance looking into this pin is
10k to ground.
ROFSC (Pin 29): Bipolar Offset Network for DAC C. 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 RIN2 (Pin 32). The
impedance looking into this pin is 20k to ground.
REFC (Pin 30): Reference Input for DAC C, and connec-
tion for internal reference inverting resistor R4. The 20k
resistor R4 is connected internally from RCOM2 to REFC.
For normal operation tie this pin to the output of reference
inverting amplier A2 (see Typical Applications). Typically
–5V; accepts up to ±15V. The impedance looking into this
pin is 10k to ground (RIN2 and RCOM2 oating).
RCOM2 (Pin 31): Center Tap Point for the Reference Ampli-
er A2 Inverting Resistors. The 20k reference inverting
resistors R3 and R4 are connected internally from RIN2 to
RCOM2 and from RCOM2 to REFC, respectively (see Block
Diagram). For normal operation tie RCOM2 to the negative
input of external reference inverting amplier A2 (see
Typical Applications).
RIN2 (Pin 32): Input Resistor R3 for Reference Inverting
Amplier A2. The 20k resistor R3 is connected internally
from RIN2 to RCOM2. For normal operation tie RIN2 to the
external reference voltage VREF2 (seeTypicalApplications).
Typically 5V; accepts up to ±15V.
MSPAN (Pin 33): Manual Span Control Pin. MSPAN is used
to congure the LTC2755 for operation in a single, xed
output range. When congured for single-span operation,
the output range is set via hardware pin strapping. The
span I/O port’s input, and DAC, registers are transparent
and do not respond to write or update commands.
To congure the part for single-span use, tie MSPAN directly
to VDD. If MSPAN is instead connected to GND (SoftSpan
conguration), the output ranges are set and veried by
using write, update and read operations. See Manual Span
Conguration in the Operation section. MSPAN must be
connected either directly to GND (SoftSpan conguration)
or VDD, Pin 15 (single-span conguration).
IOUT2C (Pin 34): DAC C Current Output Complement. Tie
IOUT2C to ground.
GND (Pin 35): Shield Ground, provides necessary shield-
ing for IOUT2C. Tie to ground.
D0-D2 (Pins 36-38): LTC2755-12 Only. DAC Input/Output
Data Bits. These I/O pins set and read back the DAC code.
D0 is the LSB.
D0-D4 (Pins 36-40): LTC2755-14 Only. DAC Input/Output
Data Bits. These I/O pins set and read back the DAC code.
D0 is the LSB.
D0-D6 (Pins 36-42): LTC2755-16 Only. DAC Input/Output
Data Bits. These I/O pins set and read back the DAC code.
D0 is the LSB.
NC (Pins 39-44): LTC2755-12 Only. No Internal Connection.
NC (Pins 41-44): LTC2755-14 Only. No Internal Connection.
NC (Pins 43-44): LTC2755-16 Only. No Internal Connection.
GND (Pin 45): Shield Ground, provides necessary shield-
ing for IOUT2B. Tie to ground.
IOUT2B (Pin 46): DAC B Current Output Complement. Tie
IOUT2B to ground.
S0 (Pin 47): Span I/O Bit 0. Pins S0, S1 and S2 are used
to program and to read back the output ranges of the
DACs.
D/S (Pin 48): Data/Span Select. This pin is used to select
the data I/O port or the span I/O port (D0 to D15 or S0 to
S2, respectively), along with their respective dedicated
registers, for write and read operations. Update opera-
tions ignore D/S, since all updates affect both data and
span registers. See Table 1. For single-span operation,
tie D/S to ground.
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