LTC1290BCSW datasheet(4/28 Pages) LINER

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LTC1290

LTC1290B/LTC1290C/LTC1290D

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ISINK

Output Sink Current

VOUT = VCC

ICC

Positive Supply Current

CS High

612

CS High

LTC1290BC, LTC1290CC

510

µA

Power Shutdown LTC1290DC, LTC1290BI

ACLK Off

LTC1290CI, LTC1290DI

LTC1290BM, LTC1290CM q

515

µA

LTC1290DM

IREF

Reference Current

VREF = 5V

µA

I–

Negative Supply Current

CS High

150

µA

ELECTRICAL C

HARA TER STICS

DIGITAL A D

(Note 3)

below V – or one diode drop above VCC. Be careful during testing at low

VCC levels (4.5V), as high level reference or analog inputs (5V) can cause

this input diode to conduct, especially at elevated temperatures and cause

errors for inputs near full scale. This spec allows 50mV forward bias of

either diode. 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 will therefore

require a minimum supply voltage of 4.950V over initial tolerance,

temperature variations and loading.

Note 8: Channel leakage current is measured after the channel selection.

Note 9: To minimize errors caused by noise at the chip select input, the

internal circuitry waits for two ACLK falling edge after a chip select falling

edge is detected before responding to control input signals. Therefore, no

attempt should be made to clock an address in or data out until the

minimum chip select setup time has elapsed.

Note 10: Increased leakage currents at elevated temperatures cause the

S/H to droop, therefore it's recommended that fACLK ≥ 500kHz at 125°C,

fACLK ≥ 125kHz at 85°C and fACLK ≥ 15kHz at 25°C.

The q denotes specifications which apply over the full operating

temperature range; all other limits and typicals TA = 25°C.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: All voltage values are with respect to ground with DGND, AGND

and REF– wired together (unless otherwise noted).

Note 3: VCC = 5V, VREF+ = 5V, VREF – = 0V, V

– = 0V for unipolar mode and

– 5V for bipolar mode, ACLK = 4.0MHz unless otherwise speicfied.

Note 4: These specs apply for both unipolar and bipolar modes. In bipolar

mode, one LSB is equal to the bipolar input span (2VREF) divided by 4096.

For example, when VREF = 5V, 1LSB (bipolar) = 2(5V)/4096 = 2.44mV.

Note 5: Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.

The deviation is measured from the center of the quantization band.

Note 6: Recommended operating conditions.

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

HARA TERISTICS

TYPICALPERFOR

Supply Current vs Temperature

Supply Current vs Supply Voltage

Unadjusted Offset Voltage vs

Reference Voltage

SUPPLY VOLTAGE, VCC (V)

1290 • TPC01

ACLK = 4MHz

TA = 25°C

AMBIENT TEMPERATURE, TA (°C)

–50

LT1290 • TPC02

–10

–30

90 110 130

ACLK = 4MHz

VCC = 5V

REFERENCE VOLTAGE, VREF (V)

1290 • TPC03

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

VOS = 0.25mV

VOS = 0.125mV

VCC = 5V

LTC1290BCSW 数据表(PDF) 4 Page - Linear Technology

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