TS4657 datasheet(8/26 Pages) STMICROELECTRONICS

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Electrical characteristics

TS4657

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3.3.1

Terminology

SNR: signal-to-noise ratio is expressed in dB. The theoretical formula is:

where Vnoise is the integrated noise from 20 Hz to 20 kHz and VH1 is the fundamental of the

signal.

For unweighted measurements, the SNR is given by:

where vnoise is the noise spectral density and u(f) is the unweighted filter transfer function

(20 Hz, 20 kHz).

For A-weighted measurements:

where vnoise is the noise spectral density and A(f) is the A-weighted filter transfer function.

Table 7.

VCC =5V, Rload= 10 kΩ, Cload = 100 pF, T = 25° C (unless otherwise specified)

Symbol

Parameter

Min.

Typ.

Max.

Unit

Dynamic range; A-weighted

16-bit data; measured at -60 dBFS, FS =48kHz, Fin = 1 kHz

SNR

Signal-to-noise ratio, FS =48 kHz, Fin = 1 kHz, referred to

output

Vin at -6 dBFS; A-weighted, 18-bit data input

Vin at -6 dBFS; unweighted, 18-bit data input

Vin at 0 dBFS; A-weighted, 16-bit data input

THD+N

Total harmonic distortion and noise. Fin = 1 kHz

Vin at -20 dBFS

Vin at -6 dBFS

Vin at 0 dBFS

82.5

81.5

PSRR

Power supply rejection ratio, Vripple = 200 mVpp

F= 217 Hz

F= 1 kHz

20 Hz < F < 20 kHz

LRiso

Channel separation. 1 kHz, Vin at 0 dBFS

100

Voo

Output offset voltage

-20

Gain channel balance

-0.2

0.01

0.2

twu

Wake-up time(1)

34.5

See timing diagram in application information.

SNR

noise

-------------------

⎝⎠

⎜⎟

⎛⎞

log

SNR

() v

noise f

()

20Hz

20kHz

∫

----------------------------------------------------------------------

log

SNR

() v

noise f

()

20Hz

20kHz

∫

-----------------------------------------------------------------------

log

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