![](http://datasheet.mmic.net.cn/Analog-Devices-Inc/AD7739BRU_datasheet_100434/AD7739BRU_5.png)
Data Sheet
AD7739
Rev. A | Page 5 of 32
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
POWER REQUIREMENTS
AVDD to AGND Voltage
4.75
5.25
V
DVDD to DGND Voltage
4.75
5.25
V
2.70
3.60
V
AVDD Current (Normal Mode)
13.6
16
mA
AVDD Current (Reduced Power Mode)
9.2
11
mA
MCLK = 4 MHz
AVDD Current (Internal Buffer Off )
8.5
mA
DVDD Current (Normal Mode)13 2.7
3
mA
DVDD = 5 V
DVDD Current (Normal Mode)13 1.0
1.5
mA
DVDD = 3 V
Power Dissipation (Normal Mod
e)1385
100
mW
Power Dissipation (Reduced Power
60
70
mW
DVDD = 5 V, MCLK = 4 MHz
Power Dissipation (Reduced Power
50
mW
DVDD = 3 V, MCLK = 4 MHz
AVDD + DVDD Current (Standby
80
μA
Power Dissipation (Standby Mo
de)14500
μW
1 Specification is not production tested, but is supported by characterization data at initial product release.
3 Specifications before calibration. Channel system calibration reduces these errors to the order of the noise.
4 Applies after the zero-scale and full-scale calibration. The negative full-scale error represents the remaining error after removing the offset and gain error.
5 Specifications before calibration. ADC zero-scale self-calibration or channel zero-scale system calibration reduce this error to the order of the noise.
6 For specified performance. The output data span corresponds to the specified nominal input voltage range. The ADC is functional outside the nominal input voltage
range, but the performance might degrade. Outside the nominal input voltage range, the OVR bit in the channel status register is set and the channel data register
value depends on the clamp bit in the mode register. See the register and circuit descriptions for details.
7 For specified performance. If the analog input absolute voltage (referred to AGND) changes more than 0.5 V during one conversion time, the result can be affected by
distortion in the input buffer. This limit does not apply to analog input absolute voltages below 3 V.
8 If chopping is enabled or when switching between channels, a dynamic current charges the capacitance of the multiplexer. See the circuit description for details.
9 For specified performance. Part is functional with lower VREF.
10 Dynamic current charging the sigma-delta (Σ-Δ) modulator input switching capacitor.
11 Outside the specified calibration range, calibration is possible but the performance may degrade.
12 These logic output levels apply to the MCLK OUT output when it is loaded with a single CMOS load.
13 With external MCLK, MCLKOUT disabled (CLKDIS bit set in the mode register).
14 External MCLKIN = 0 V or DVDD, digital inputs = 0 V or DVDD, P0 and P1 = 0 V or AVDD.
TIMING SPECIFICATIONS
AVDD = 5 V ± 5%, DVDD = 2.7 V to 3.6 V or 5 V ± 5%, Input Logic 0 = 0 V, Logic 1 = DVDD, unless otherwise noted.1 Table 2.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
MASTER CLOCK RANGE
1
6.144
MHz
1
4
MHz
Reduced power mode
t1
50
ns
SYNC pulse width
t2
500
ns
RESET pulse width
READ OPERATION
t4
0
ns
CS falling edge to SCLK falling edge setup time
SCLK falling edge to data valid delay
0
60
ns
DVDD of 4.75 V to 5.25 V
0
80
ns
DVDD of 2.7 V to 3.3 V
CS falling edge to data valid delay
0
60
ns
DVDD of 4.75 V to 5.25 V
0
80
ns
DVDD of 2.7 V to 3.3 V
t6
50
ns
SCLK high pulse width
t7
50
ns
SCLK low pulse width
t8
0
ns
CS rising edge after SCLK rising edge hold time
10
80
ns
Bus relinquish time after SCLK rising edge