AD5421CREZ-RL7 datasheet(9/36 Pages) AD

Numer części	AD5421CREZ-RL7

Szczegółowy opis	16-Bit, Serial Input, Loop-Powered, 4 mA to 20 mA DAC

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Producent	AD [Analog Devices]

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Data Sheet

AD5421

Rev. F | Page 9 of 36

AC PERFORMANCE CHARACTERISTICS

Loop voltage = 24 V; REFIN = 2.5 V external; RL = 250 Ω; all specifications TMIN to TMAX, unless otherwise noted.

Table 3.

Parameter1

Min

Typ

Max

Unit

Test Conditions/Comments

DYNAMIC PERFORMANCE

Loop Current Settling Time

50

µs

To 0.1% FSR, CIN = open circuit

Loop Current Slew Rate

400

µA/µs

CIN = open circuit

AC Loop Voltage Sensitivity

1.3

µA/V

1200 Hz to 2200 Hz, 5 V p-p, RL = 3 kΩ

1

Temperature range: −40°C to +105°C; typical at +25°C.

TIMING CHARACTERISTICS

Loop voltage = 24 V; REFIN = 2.5 V external; RL = 250 Ω; all specifications TMIN to TMAX.

Table 4.

Parameter1, 2, 3

Limit at TMIN, TMAX

Unit

Description

t1

33

ns min

SCLK cycle time

t2

17

ns min

SCLK high time

t3

17

ns min

SCLK low time

t4

17

ns min

SYNC falling edge to SCLK falling edge setup time

t5

10

ns min

SCLK falling edge to SYNC rising edge

t6

25

µs min

Minimum SYNC high time

t7

5

ns min

Data setup time

t8

5

ns min

Data hold time

t9

25

µs min

SYNC rising edge to LDAC falling edge

t10

10

ns min

LDAC pulse width low

t11

70

ns max

SCLK rising edge to SDO valid (CL SDO = 30 pF)

t12

0

ns min

SYNC falling edge to SCLK rising edge setup time

t13

70

ns max

SYNC rising edge to SDO tristate (CL SDO = 30 pF)

1

Guaranteed by design and characterization; not production tested.

2

All input signals are specified with tR = tF = 5 ns (10% to 90% of DVDD) and timed from a voltage level of 1.2 V.

3

See Figure 2 and Figure 3.

Table 5. SPI Watchdog Timeout Periods

Parameter1

Min

Typ

Max

Unit

T0

T1

T2

0

43

50

59

ms

0

1

87

100

117

ms

0

1

0

436

500

582

ms

0

1

873

1000

1163

ms

1

0

1746

2000

2326

ms

1

0

1

2619

3000

3489

ms

1

0

3493

4000

4652

ms

1

4366

5000

5814

ms

1

Specifications guaranteed by design and characterization; not production tested.

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