Rainbow-electronics MAX1039 Manual de usuario descargar pdf (Pagina 5)

MAX1036–MAX1039

2.7V to 5.5V, Low-Power, 4-/12-Channel

2-Wire Serial 8-Bit ADCs

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ELECTRICAL CHARACTERISTICS (continued)

= 2.7V to 3.6V (MAX1037/MAX1039), V

= 4.5V to 5.5V (MAX1036/MAX1038). External reference, V

REF

= 2.048V

(MAX1037/MAX1039), V

REF

= 4.096V (MAX1036/MAX1038). External clock, f

SCL

= 1.7MHz, T

= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Setup Time for a Repeated START

Condition (Sr)

STA

160 ns

Data Hold Time t

DAT

(Note 12) 0 150 ns

Data Setup Time t

DAT

10 ns

Rise Time of SCL Signal

(Current Source Enabled)

RCL

(Note 13) 20 80 ns

Rise Time of SCL Signal After

Acknowledge Bit

RCL1

(Note 13) 20 160 ns

Fall Time of SCL Signal t

FCL

(Note 13) 20 80 ns

Rise Time of SDA Signal t

RDA

(Note 13) 20 160 ns

Fall Time of SDA Signal t

FDA

(Note 13) 20 160 ns

Setup Time for STOP Condition t

STO

160 ns

Capacitive Load for Each Bus Line C

400 pF

Pulse Width of Spike Suppressed t

010ns

Note 1: The MAX1036/MAX1038 are tested at V

= 5V and the MAX1037/MAX1039 are tested at V

= 3V. All devices are config-

ured for unipolar, single-ended inputs.

Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range and

offsets have been calibrated.

Note 3: Offset nulled.

Note 4: Ground ON channel; sine wave applied to all OFF channels.

Note 5: Conversion time is defined as the number of clock cycles (8) multiplied by the clock period. Conversion time does not

include acquisition time. SCL is the conversion clock in the external clock mode.

Note 6: The absolute voltage range for the analog inputs (AIN0–AIN11) is from GND to V

Note 7: When AIN_/REF is configured to be an internal reference (SEL[2:1] = 11), decouple AIN_/REF to GND with a 0.01µF capacitor.

Note 8: The switch connecting the reference buffer to AIN_/REF has a typical on-resistance of 675Ω.

Note 9: ADC performance is limited by the converter’s noise floor, typically 1.4mV

P-P

Note 10: Electrical characteristics are guaranteed from V

DD(min)

to V

DD(max)

. For operation beyond this range, see the Typical

Operating Characteristics.

Note 11: Power-supply rejection ratio is measured as:

, for the MAX1037/MAX1039 where N is the number of bits (8) and V

REF

= 2.048V.

Power-supply rejection ratio is measured as:

, for the MAX1036/MAX1038 where N is the number of bits (8) and V

REF

= 2.048V.

Note 12: A master device must provide a data hold time for SDA (referred to V

of SCL) in order to bridge the undefined region of

SCL’s falling edge (Figure 1).

Note 13: C

= total capacitance of one bus line in pF. t

and t

measured between 0.3V

and 0.7V

. Minimum specification is

tested at +25°C with C

= 400pF.

Note 14: f

SCLH

must meet the minimum clock low time plus the rise/fall times.

VVVV

FS FS

REF

55 45

()

−

()

[]

−

VVVV

FS FS

REF

33 27

()

−

()

[]

−

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Rainbow-electronics MAX1039 Manual de usuario Pagina 5

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