5

DS1072PP1

CS7250B

3 Characteristics and Specifications

3 Characteristics and Specifications

Table 3-1. Parameter Definitions

Parameter

Definition

Sensitivity

A measure of the microphone output response to the acoustic pressure of a 1-kHz, 94 dB SPL (1 Pa RMS)

sine wave. This is referenced to the output Full Scale Range (FSR) of the microphone.

Full Scale Range (FSR)

Sensitivity, electrical noise floor and power supply rejection are measured with reference to the output full

scale range (FSR) of the microphone. FSR is defined as the amplitude of a 1-kHz sine-wave output whose

positive peak value reaches 100% density of logic 1s and whose negative peak value reaches 0% density

of logic 1s. This is the largest 1-kHz sine wave that fits in the digital output range without clipping. Note that,

because the definition of FSR is based on a sine wave, it is possible to support a square wave test signal

output whose level is +3 dBFS.

Total harmonic distortion (THD)

The ratio of the RMS sum of the harmonic distortion products in the specified bandwidth (see note) relative

to the RMS amplitude of the fundamental (i.e., test frequency) output.

Signal-to-noise ratio (SNR)

A measure of the difference in level between the output response of a 1-kHz, 94 dB SPL sine wave and the

idle noise output.

Dynamic Range (DR)

The ratio of the 10% THD microphone output level (in response to a sine wave input) and the idle noise

output.

Note: Unless otherwise specified, all performance measurements are specified with a low-pass brick-wall filter and, where noted, an

A-weighted filter. The low-pass filter removes out-of-band noise.

Table 3-2. Recommended Operating Conditions

Parameter

Symbol

Min

Typ

Max

Units

Supply voltage

VDD

1.62

1.8

1.98

V

Ground

GND

—

0

—

V

Clock frequency

0.3

—

3.2

MHz

Operating temperature range

–40

—

+85

ºC

Table 3-3. Absolute Maximum Ratings

Absolute maximum ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits.

Device functional operating limits and guaranteed performance specifications are given under electrical characteristics at the test conditions specified.

Parameter

Symbol

Min

Max

Units

1.All voltages are measured with respect to GND.

VDD

–0.3

2.4

V

Input voltage 1

–0.3

2.If VDD is above the minimum recommended operating level (see Table 3-2), the maximum input voltage is VDD + 0.3 V.

V

3.Input current is positive when flowing into the device.

–10

+10

mA

Operating temperature range

–40

+105

ºC

Storage temperature prior to soldering

—30

ºC

Storage relative humidity prior to soldering

—60

%

Storage temperature after soldering

–40

+105

ºC

ESD-sensitive device. The CS7250B is manufactured on a CMOS process. It is therefore generically susceptible to damage from

excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. This device is

qualified to current JEDEC ESD standards