AD7705 데이터 시트보기 (PDF) - Analog Devices
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AD7705 Datasheet PDF : 32 Pages
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AD7705/AD7706
Parameter
B Version1
Units
Conditions/Comments
LOGIC OUTPUTS (Including MCLK OUT)
VOL, Output Low Voltage
VOL, Output Low Voltage
VOH, Output High Voltage
VOH, Output High Voltage
Floating State Leakage Current
Floating State Output Capacitance13
Data Output Coding
0.4
0.4
4
VDD–0.6
± 10
9
Binary
Offset Binary
V max
V max
V min
V min
µA max
pF typ
ISINK = 800␣ µA Except for MCLK OUT.12 VDD = 5 V.
ISINK = 100␣ µA Except for MCLK OUT.12 VDD = 3 V.
ISOURCE = 200 µA Except for MCLK OUT.12 VDD = 5 V.
ISOURCE = 100␣ µA Except for MCLK OUT.12 VDD = 3 V.
Unipolar Mode
Bipolar Mode
SYSTEM CALIBRATION
Positive Full-Scale Calibration Limit14
Negative Full-Scale Calibration Limit14
Offset Calibration Limit14
Input Span15
POWER REQUIREMENTS
VDD Voltage
Power Supply Currents16
VDD Voltage
Power Supply Currents16
Standby (Power-Down) Current17
Power Supply Rejection18
(1.05 × VREF)/GAIN
–(1.05 × VREF)/GAIN
–(1.05 × VREF)/GAIN
(0.8 × VREF)/GAIN
(2.1 × VREF)/GAIN
V max
V max
V max
V min
V max
+2.7 to +3.3
V min to V max
0.32
0.6
0.4
0.6
0.7
1.1
+4.75 to +5.25
mA max
mA max
mA max
mA max
mA max
mA max
V min to V max
0.45
0.7
0.6
0.85
0.9
1.3
16
8
See Note 19
mA max
mA max
mA max
mA max
mA max
mA max
µA max
µA max
dB typ
GAIN Is the Selected PGA Gain (1 to 128)
GAIN Is the Selected PGA Gain (1 to 128)
GAIN Is the Selected PGA Gain (1 to 128)
GAIN Is the Selected PGA Gain (1 to 128)
GAIN Is the Selected PGA Gain (1 to 128)
For Specified Performance
Digital I/Ps = 0␣ V or VDD. External MCLK IN and
CLK DIS = 1
BUF Bit = 0. fCLKIN = 1␣ MHz. Gains of 1 to 128
BUF Bit = 1. fCLKIN = 1␣ MHz. Gains of 1 to 128
BUF Bit = 0. fCLKIN = 2.4576␣ MHz. Gains of 1 to 4
BUF Bit = 0. fCLKIN = 2.4576␣ MHz. Gains of 8 to 128
BUF Bit = 1. fCLKIN = 2.4576␣ MHz. Gains of 1 to 4
BUF Bit = 1. fCLKIN = 2.4576␣ MHz. Gains of 8 to 128
For Specified Performance
Digital I/Ps = 0␣ V or VDD. External MCLK IN and
CLK DIS = 1.
BUF Bit = 0. fCLKIN = 1␣ MHz. Gains of 1 to 128
BUF Bit = 1. fCLKIN = 1␣ MHz. Gains of 1 to 128
BUF Bit = 0. fCLKIN = 2.4576␣ MHz. Gains of 1 to 4
BUF Bit = 0. fCLKIN = 2.4576␣ MHz. Gains of 8 to 128
BUF Bit = 1. fCLKIN = 2.4576␣ MHz. Gains of 1 to 4
BUF Bit = 1. fCLKIN = 2.4576␣ MHz. Gains of 8 to 128
External MCLK IN = 0 V or VDD. VDD = 5 V. See Figure 9
External MCLK IN = 0 V or VDD. VDD = 3 V
NOTES
1Temperature range as follows: B Version, –40°C to +85°C.
2These numbers are established from characterization or design at initial product release.
3A calibration is effectively a conversion so these errors will be of the order of the conversion noise shown in Tables I and III. This applies after calibration at the
temperature of interest.
4Recalibration at any temperature will remove these drift errors.
5Positive Full-Scale Error includes Zero-Scale Errors (Unipolar Offset Error or Bipolar Zero Error) and applies to both unipolar and bipolar input ranges.
6Full-Scale Drift includes Zero-Scale Drift (Unipolar Offset Drift or Bipolar Zero Drift) and applies to both unipolar and bipolar input ranges.
7Gain Error does not include Zero-Scale Errors. It is calculated as Full-Scale Error–Unipolar Offset Error for unipolar ranges and Full-Scale Error–Bipolar Zero Error for
bipolar ranges.
8Gain Error Drift does not include Unipolar Offset Drift/Bipolar Zero Drift. It is effectively the drift of the part if zero scale calibrations only were performed.
9This common-mode voltage range is allowed provided that the input voltage on analog inputs does not go more positive than VDD + 30 mV or go more negative than
GND – 30␣ mV. Parts are functional with voltages down to GND – 200 mV, but with increased leakage at high temperature.
10The analog input voltage range on AIN(+) is given here with respect to the voltage on AIN(–) on the AD7705 and is given with respect to the COMMON input on the
AD7706. The absolute voltage on the analog inputs should not go more positive than VDD + 30␣ mV, or go more negative than GND␣ – 30␣ mV for specified performance, input
voltages of GND – 200 mV can be accommodated, but with increased leakage at high temperature.
11VREF = REF IN(+) – REF IN(–).
12These logic output levels apply to the MCLK OUT only when it is loaded with one CMOS load.
13Sample tested at +25°C to ensure compliance.
14After calibration, if the analog input exceeds positive full scale, the converter will output all 1s. If the analog input is less than negative full scale, the device will output all 0s.
15These calibration and span limits apply provided the absolute voltage on the analog inputs does not exceed VDD + 30␣ mV or go more negative than GND – 30␣ mV. The offset
calibration limit applies to both the unipolar zero point and the bipolar zero point.
16When using a crystal or ceramic resonator across the MCLK pins as the clock source for the device, the VDD current and power dissipation will vary depending on the crystal or
resonator type (see Clocking and Oscillator Circuit section).
17If the external master clock continues to run in standby mode, the standby current increases to 150␣ µA typical at 5 V and 75 µA at 3 V. When using a crystal or ceramic
resonator across the MCLK pins as the clock source for the device, the internal oscillator continues to run in standby mode and the power dissipation depends on the crystal
or resonator type (see Standby Mode section).
18Measured at dc and applies in the selected passband. PSRR at 50␣ Hz will exceed 120␣ dB with filter notches of 25 Hz or 50␣ Hz. PSRR at 60␣ Hz will exceed 120␣ dB with filter
notches of 20 Hz or 60␣ Hz.
19PSRR depends on both gain and VDD.
Gain
VDD = 3 V
VDD = 5 V
1 2 4 8–128
86 78 85 93
90 78 84 91
Specifications subject to change without notice.
REV. A
–3–
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