ADC1005S060_3 © IDT 2012. All rights reserved.
Product data sheet Rev. 03 — 2 July 2012 9 of 18
Integrated Device Technology
ADC1005S060
Single 10 bits ADC, up to 60 MHz
[1] The rise and fall times of the clock signal must not be less than 0.5 ns.
[2] The input admittance is
[3] Analog input voltages producing code 0 up to and including code 1023:
a) Voffset BOTTOM is the difference between the analog input which produces data equal to 00 and the reference voltage on pin RB
(VRB) at Tamb = 25 C.
b) Voffset TOP is the difference between the reference voltage on pin RT (VRT) and the analog input which produces data outputs equal
to code 1023 at Tamb = 25 C.
[4] To ensure the optimum linearity performance of such a converter architecture the lower and upper extremities of the converter reference
resistor ladder are connected to pins RB and RT via offset resistors ROB and ROT as shown in Figure 3.
a) The current flowing into the resistor ladder is
IVRT VRB
–
ROB RLROT
++
---------------------------------------
=
and the full-scale input range at the converter, to cover code 0
to 1023 is
VIRLIL
RL
ROB RLROT
++
--------------------------------------- VRT VRB
+0.8375 VRT VRB
–== =
b) Since RL, ROB and ROT have similar behavior with respect to process and temperature variation, the ratio
RL
ROB RLROT
++
---------------------------------------
will be kept reasonably constant from device to device. Consequently, variation of the output codes at a given input voltage depends
mainly on the difference VRT VRB and its variation with temperature and supply voltage. When several ADCs are connected in
parallel and fed with the same reference source, the matching between each of them is optimized.
[5]
EG
V1023 V0
–Vip p–
–
Vip p–
-------------------------------------------------------100=
[6] The analog bandwidth is defined as the maximum input sine wave frequency which can be applied to the device. No glitches greater
than 2 LSB, neither any significant attenuation are observed in the reconstructed signal.
[7] The analog input settling time is the minimum time required for the input signal to be stabilized after a sharp full-scale input (square
wave signal) in order to sample the signal and obtain correct output data.
[8] Effective bits are obtained via a Fast Fourier Transform (FFT) treatment taking 8000 acquisition points per equivalent fundamental
period. The calculation takes into account all harmonics and noise up to half the clock frequency (Nyquist frequency). Conversion to
signal-to-noise ratio: S/N = ENOB 6.02 + 1.76 dB.
[9] Intermodulation measured relative to either tone with analog input frequencies of 4.3 MHz and 4.5 MHz. The two input signals have the
same amplitude and the total amplitude of both signals provides full-scale to the converter.
[10] Output data acquisition: the output data is available after the maximum delay time of td(o). IDT recommends the lowest possible output
load. These parameters are guaranteed by characterization and not by production test.
CLload capacitance - - 10 pF
SR slew rate VCCO = 2.7 V 0.2 0.3 -V/ns
3-state output delay times (fclk = 60 MHz; VCCO = 3.3 V); see Figure 5
tdZH float to active
HIGH delay time
-16 20 ns
tdZL float to active
LOW delay time
-30 34 ns
tdHZ active HIGH to
float delay time
-25 30 ns
tdLZ active LOW to
float delay time
-23 27 ns
Table 6. Characteristics …continued
VCCA = 4.75 V to 5.25 V; VCCD = 4.75 V to 5.25 V; AGND and DGND shorted together; Tamb = 0
C to 70
C; typical values
measured at VCCA = VCCD = 5 V; VCCO = 3.3 V; VRB = 1.3 V; VRT = 3.7 V; CL = 10 pF and Tamb = 25
C unless otherwise
specified.
Symbol Parameter Conditions Min Typ Max Unit