Datasheet

TLC3544, TLC3548
5-V ANALOG, 3-/5-V DIGITAL, 14-BIT, 200-KSPS, 4-/8-CHANNELS SERIAL
ANALOG-TO-DIGITAL CONVERTERS WITH 0-5 V (PSEUDODIFFERENTIAL) INPUTS
SLAS266C – OCTOBER 2000 – REVISED MAY 2003
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
general electrical characteristics over recommended operating free-air temperature range,
single-ended input, normal long sampling, 200 KSPS, AV
DD
= 5 V, external reference (V
REFP
= 4V,
V
REFM
= 0 V) or internal reference, SCLK frequency = 25 MHz, fixed channel at CONV mode 00,
analog input signal source resistance = 25 Ω (unless otherwise noted) (continued)
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
DC Accuracy—Normal Short Sampling
E
L
Integral linearity error See Note 3 ±0.8 LSB
E
D
Differential linearity error ±0.6 LSB
E
O
Zero offset error See Note 4 –3 ±0.6 3 LSB
E
(g+)
Gain error See Note 4 0 5 12 LSB
AC Accuracy—Normal Long Sampling
SINAD
Signal to noise ratio + distortion
f
i
= 20 kHz 78.6 80.8
dB
SINAD Signal-to-noise ratio + distortion
f
i
= 100 kHz
77.6
dB
THD
Total harmonic distortion
f
i
= 20 kHz –95 –90
dB
THD Total harmonic distortion
f
i
= 100 kHz
–88
dB
SFDR
S
p
urious free dynamic range
f
i
= 20 kHz 90 97
dB
SFDR Spurious free dynamic range
f
i
= 100 kHz
89
dB
ENOB
Effective number of bits
f
i
= 20 kHz 12.8 13.1
Bits
ENOB Effective number of bits
f
i
= 100 kHz
12.6
Bits
SNR
Signal to noise ratio
f
i
= 20 kHz 79 81
dB
SNR Signal-to-noise ratio
f
i
= 100 kHz
78
dB
Channel-to-channel isolation (see
Notes 2 and 5)
Fixed channel in conversion mode 00, f
i
= 35 kHz 100 dB
Analog in
p
ut bandwidth
Full power bandwidth, –1 dB 2
MHz
Analog input bandwidth
Full power bandwidth, –3 dB
2.5
MHz
AC Accuracy—Normal Short Sampling
SINAD
Signal to noise ratio + distortion
f
i
= 20 kHz 78.9
dB
SINAD Signal-to-noise ratio + distortion
f
i
= 100 kHz
77.6
dB
THD
Total harmonic distortion
f
i
= 20 kHz –95
dB
THD Total harmonic distortion
f
i
= 100 kHz
–88
dB
SNR
Signal to noise ratio
f
i
= 20 kHz 79
dB
SNR Signal-to-noise ratio
f
i
= 100 kHz
78
dB
ENOB
Effective number of bits
f
i
= 20 kHz 12.8
Bits
ENOB Effective number of bits
f
i
= 100 kHz
12.6
Bits
SFDR
S
p
urious free dynamic range
f
i
= 20 kHz 97
dB
SFDR Spurious free dynamic range
f
i
= 100 kHz
89
dB
Channel-to-channel isolation (see
Notes 2 and 5)
Fixed channel in conversion mode 00, f
i
= 35 kHz 100 dB
Analog in
p
ut bandwidth
Full power bandwidth, –1 dB 2
MHz
Analog input bandwidth
Full power bandwidth, –3 dB 2.5
MHz
†
All typical values are at T
A
= 25°C.
NOTES: 2. This is for a fixed channel in conversion mode 00 or 01. When switching the channels, additional multiplexer setting time is required
to overcome the memory effect of the charge redistribution DAC (refer to Figure 8).
3. Linear error is the maximum deviation from the best fit straight line through the A/D transfer characteristics.
4. Zero offset error is the difference between 0000000000000 and the converted output for zero input voltage; gain error is the
difference between 11111111111111 and the converted output for full-scale input voltage. The full-scale input voltage is equal to the
reference voltage being used.
5. It is measured by applying a full-scale of 35 kHz signal to other channels and determining how much the signal is attenuated in the
channel of interest. The converter samples this examined channel continuously. The channel-to-channel isolation is degraded if the
converter samples different channels alternately (refer to Figure 8).