STA1295 datasheet(86/109 Pages) STMICROELECTRONICS

86 / 109 page

Electrical characteristics

STA1295, STA1275

86/109

DS12586 Rev 5

Figure 5. 24-26 MHz crystal connection

To drive the 24/26 MHz crystal pins from an external clock source, use Force Through

Mode: Bias MXTALO at 1.25 V. Apply external single ended square clock at MXTALI. Input

clock should be of CMOS level (Low = GND, High = 2.5 V). Clock is available after OSC

startup time.

4.9

Sound subsystem

4.9.1

ADC1: Microphone

ΣΔ ADC electrical characteristics

24-26 MHz

Crystal

MXTALI

MXTALO

Device

LMMXTAL RMMXTAL CMMXTAL

COMXTAL

Crystal Model

Table 43. MICADC electrical characteristics

Symbol

Parameter

Limit values

Unit

Min.

Typ.

Max.

VASupply

SR Analog supply

3.0

3.3

3.6

Vin

Differential analog input

5.6

Vp-p

2.0

Vrms

Vin

SR Single ended analog input

2.8

Vp-p

1.0

Vrms

Vcom

DC coupled input common mode

1.5

1.65

1.8

AC coupled input common mode

1.65

3.3

SNR

Differential mode signal to noise ratio

(A-weighted, Output rate 48 kHz, BW = 20 kHz)

SNR

Differential mode signal to noise ratio

(Unweighted, Output rate 48 kHz, BW = 3.2 kHz)

SNR

Single ended mode signal to noise ratio

(A-weighted, Output rate 48 kHz, BW = 20 kHz)

SNR

Single ended mode Signal to Noise ratio

(Unweighted, Output rate 48 kHz, BW = 3.2 kHz)

THD + N

Differential mode Total harmonic distortion + Noise

-80

-85

THD + N

Single ended mode Total harmonic distortion + Noise

-74

-79

VMIC_BIAS

MIC_BIAS

2.5(1)

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