ADC0808S125 View Datasheet(PDF) - Integrated Device Technology

Part Name

Description

Manufacturer

ADC0808S125

Single 8-bit ADC, up to 125 MHz or 250 MHz

Integrated Device Technology 

Integrated Device Technology

ADC0808S125/250

Single 8-bit ADC, up to 125 MHz or 250 MHz

Table 13. Dynamic characteristics …continued

VCCA = 3.0 V to 3.6 V; VCCD = 1.65 V to 1.95 V; VCCO = 1.65 V to 1.95 V; pins AGND1, AGND2 and DGND1 shorted together;

Tamb = 40 C to +85 C; Vi(IN)  Vi(INN) = 2.0 V  0.5 dB; VI(cm) = 0.95 V; VFSIN = 0 V; typical values are measured at

VCCA = 3.3 V, VCCD = VCCO = 1.8 V, Tamb = 25 C and CL = 10 pF; unless otherwise specified.

Symbol Parameter

Conditions

Min Typ Max Unit

SFDR

spurious free dynamic range fclk = 125 MHz; fi = 78 MHz

-

55

-

dBc

fclk = 250 MHz; fi = 125 MHz

-

55

-

dBc

IMD2

second-order intermodulation f1 = 124 MHz; f2 = 126 MHz;

[5] -

55 -

dB

distortion

fclk = 250 MHz

IMD3

third-order intermodulation

f1 = 124 MHz; f2 = 126 MHz;

[5] -

60 -

dB

distortion

fclk = 250 MHz

[1] Output data acquisition: the output data is available after the maximum delay of td(o).

[2] The 3 dB analog bandwidth is determined by the 3 dB reduction in the reconstructed output, the input being a full-scale sine wave.

[3] The total harmonic distortion is obtained with the addition of the first five harmonics.

[4] The signal-to-noise ratio takes into account all harmonics above five and noise up to Nyquist frequency.

[5] Intermodulation measured relative to either tone with analog input frequencies f1 and f2. The two input signals have the same amplitude

and the total amplitude of both signals provides full-scale to the converter (6 dB below full-scale for each input signal). IMD3 is the ratio

of the RMS value of either input tone to the RMS value of the worst case third-order intermodulation product.

12. Definitions

12.1 Static parameters

12.1.1 Integral non-linearity

Integral non-linearity (INL) is defined as the deviation of the transfer function from a

best-fit straight line (linear regression computation). The INL of the code is obtained from

the equation:

INLi = -V---i--n-----i------–----V--S--i--n-----i--d---e---a---l---

(1)

where: S corresponds to the slope of the ideal straight line (code width), i corresponds to

the code value, Vin is the input voltage.

12.1.2 Differential non-linearity

Differential non-linearity (DNL) is the deviation in code width from the value of 1 LSB.

DNLi = -V---i--n-----i---+-----1--S-----–-----V---i--n-----i---

(2)

where: Vin is the input voltage; i is a code value from 0 to (2n  2).

12.2 Dynamic parameters

Figure 10 shows the spectrum of a single tone full-scale input sine wave of frequency ft,

conforming to coherent sampling and which is digitized by the ADC under test. Coherent

sampling: (ft / fs = M / N, where M = number of cycles and N = number of samples,

M and N values being relatively prime).

ADC0808S125_ADC0808S250_4

Product data sheet

Rev. 04 — 2 July 2012

© IDT 2012. All rights reserved.

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