MAX1234ETI+T Maxim Integrated Products, MAX1234ETI+T Datasheet - Page 43

• Manufacturer Part Number: MAX1234ETI+T
• Description: IC CNTRLR TOUCH 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Resistiver

Specifications of MAX1234ETI+T

• Touch Panel Interface: 4-Wire
• Number Of Inputs/keys: 1, 4 x 4 Keypad
• Resolution (bits): 8, 10, 12 b
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Data Rate/sampling Rate (sps, Bps): 50k
• Voltage Reference: Internal
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Applications: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

For a waveform perfectly reconstructed from digital sam-
ples, signal-to-noise ratio (SNR) is the ratio of full-scale
analog input (RMS value) to the RMS quantization error
(residual error). The ideal, theoretical minimum analog-
to-digital noise is caused by quantization error only and
results directly from the ADC’s resolution (N bits):
In reality, there are other noise sources besides quanti-
zation noise: thermal noise, reference noise, clock jitter,
etc. SNR is computed by taking the ratio of the RMS
signal to the RMS noise, which includes all spectral
components minus the fundamental, the first five har-
monics, and the DC offset.
Signal-to-noise plus distortion (SINAD) is the ratio of the
fundamental input frequency’s RMS amplitude to the
RMS equivalent of all other ADC output signals:
Effective number of bits (ENOB) indicates the global
accuracy of an ADC at a specific input frequency and
sampling rate. An ideal ADC’s error consists of
quantization noise only. With an input range equal to
the full-scale range of the ADC, calculate the effective
number of bits as follows:
Controllers Include DAC and Keypad Controller
SINAD (dB) = 20
ENOB = (SINAD - 1.76) / 6.02
SNR = (6.02
Signal-to-Noise Plus Distortion
______________________________________________________________________________________
✕
log (Signal
Effective Number of Bits
✕
Signal-to-Noise Ratio
N + 1.76) dB
±15kV ESD-Protected Touch-Screen
RMS
/ Noise
RMS
)
Total harmonic distortion (THD) is the ratio of the RMS
sum of the first five harmonics of the input signal to the
fundamental itself. This is expressed as:
where V
V
harmonics, respectively.
Spurious-free dynamic range (SFDR) is the ratio of RMS
amplitude of the fundamental (maximum signal compo-
nent) to the RMS value of the next-largest distortion
component.
For the latest package outline information, go to
www.maxim-ic.com/packages.
TRANSISTOR COUNT: 28,629
5
PACKAGE TYPE
are the amplitudes of the 2nd- through 5th-order
THD
28 TQFN
28 QFN
1
is the fundamental amplitude, and V
=
20
×
Spurious-Free Dynamic Range
log
PACKAGE CODE
⎛
⎜
⎜
⎝
Package Information
Total Harmonic Distortion
V
G2855-2
T2855-6
2
2
+
Chip Information
V
3
2
V
+
1
2
V
4
2
DOCUMENT NO.
+
V
5
21-0091
21-0140
2
⎞
⎟
⎟
⎠
2
through
43