LTC1594CS datasheet(4/24 Pages) LINER

4 / 24 page

LTC1594/LTC1598

15948fb

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tSMPL

Analog Input Sample Time

See Figure 1 in Applications Information

1.5

CLK Cycles

fSMPL(MAX)

Maximum Sampling Frequency

See Figure 1 in Applications Information

●

16.8

kHz

tCONV

Conversion Time

See Figure 1 in Applications Information

CLK Cycles

tdDO

Delay Time, CLK

↓ to DOUT Data Valid

See Test Circuits

●

250

600

tdis

Delay Time, CS

↑ to DOUT Hi-Z

See Test Circuits

●

135

300

ten

Delay Time, CLK

↓ to DOUT Enabled

See Test Circuits

●

200

thDO

Time Output Data Remains Valid After CLK

↓

CLOAD = 100pF

230

DOUT Fall Time

See Test Circuits

●

150

DOUT Rise Time

See Test Circuits

●

150

tON

Enable Turn-On Time

See Figure 1 in Applications Information

●

260

700

tOFF

Enable Turn-Off Time

See Figure 2 in Applications Information

●

100

300

tOPEN

Break-Before-Make Interval

●

160

CIN

Input Capacitance

Analog Inputs On-Channel

Off-Channel

Digital Input

AC CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All voltage values are with respect to GND.

Note 3: These devices are specified at 5V. Consult factory for 3V

specified devices (LTC1594L/LTC1598L).

Note 4: Increased leakage currents at elevated temperatures cause the S/H

to droop, therefore it is recommended that fCLK ≥ 160kHz at 85°C,

fCLK ≥ 75kHz at 70°C and fCLK ≥ 1kHz at 25°C.

Note 5: VCC = 5V, VREF = 5V and CLK = 320kHz unless otherwise specified.

CSADC and CSMUX pins are tied together during the test.

Note 6: Linearity error is specified between the actual end points of the

A/D transfer curve.

Note 7: Two on-chip diodes are tied to each reference and analog input

which will conduct for reference or analog input voltages one diode drop

below GND or one diode drop above VCC. This spec allows 50mV forward

bias of either diode for 4.5V

≤ VCC ≤ 5.5V. This means that as long as the

reference or analog input does not exceed the supply voltage by more than

50mV, the output code will be correct. To achieve an absolute 0V to 5V

input voltage range, it will therefore require a minimum supply voltage of

4.950V over initial tolerance, temperature variations and loading.

Note 8: Recommended operating condition. Not 100% production tested.

Note 9: Channel leakage current is measured after the channel selection.

TYPICAL PERFORMANCE CHARACTERISTICS

SAMPLE FREQUENCY (kHz)

0.1

100

1000

100

1594/98 G01

TA = 25°C

VCC = 5V

VREF = 5V

fCLK = 320kHz

Supply Current vs Sample Rate

TEMPERATURE (

°C)

–55

92.0

92.5

93.5

94.0

94.5

–15

125

1594/98 G03

93.0

–35

85 105

95.0

VCC = VREF = 5V

fSMPL = 16.8kHz

fCLK = 320kHz

TEMPERATURE (

°C)

–55

200

250

350

400

450

–15

125

1594/98 G02

300

–35

85 105

TA = 25°C

VCC = VREF = 5V

fCLK = 320kHz

fSMPL = 16.8kHz

Supply Current vs Temperature

Reference Current vs Temperature

The

● denotes the specifications which apply over the full operating temperature range,

otherwise specifications are at TA = 25°C. (Note 5)

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