LTC2220IUP#TRPBF Linear Technology, LTC2220IUP#TRPBF Datasheet - Page 18
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LTC2220IUP#TRPBF
Manufacturer Part Number
LTC2220IUP#TRPBF
Description
IC ADC 12BIT 170MSPS 64-QFN
Manufacturer
Linear Technology
Datasheet
1.LTC2220CUPPBF.pdf
(32 pages)
Specifications of LTC2220IUP#TRPBF
Number Of Bits
12
Sampling Rate (per Second)
170M
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
1.18W
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
64-WFQFN, Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
DYNAMIC PERFORMANCE
Signal-to-Noise Plus Distortion Ratio
The signal-to-noise plus distortion ratio [S/(N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency and the RMS amplitude of all other frequency
components at the ADC output. The output is band limited
to frequencies above DC to below half the sampling
frequency.
Signal-to-Noise Ratio
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency and
the RMS amplitude of all other frequency components
except the first five harmonics and DC.
Total Harmonic Distortion
Total harmonic distortion is the ratio of the RMS sum of all
harmonics of the input signal to the fundamental itself. The
out-of-band harmonics alias into the frequency band
between DC and half the sampling frequency. THD is
expressed as:
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through Vn are the amplitudes of the
second through nth harmonics. The THD calculated in this
data sheet uses all the harmonics up to the fifth.
Intermodulation Distortion
If the ADC input signal consists of more than one spectral
component, the ADC transfer function nonlinearity can
produce intermodulation distortion (IMD) in addition to
THD. IMD is the change in one sinusoidal input caused by
the presence of another sinusoidal input at a different
frequency.
If two pure sine waves of frequencies fa and fb are applied
to the ADC input, nonlinearities in the ADC transfer func-
tion can create distortion products at the sum and differ-
ence frequencies of mfa ± nfb, where m and n = 0, 1, 2, 3,
etc. The 3rd order intermodulation products are 2fa + fb,
2fb + fa, 2fa – fb and 2fb – fa. The intermodulation
distortion is defined as the ratio of the RMS value of either
LTC2220/LTC2221
APPLICATIO S I FOR ATIO
18
THD = 20Log (√(V2
U
2
+ V3
U
2
+ V4
2
W
+ . . . Vn
2
)/V1)
U
input tone to the RMS value of the largest 3rd order
intermodulation product.
Spurious Free Dynamic Range (SFDR)
Spurious free dynamic range is the peak harmonic or
spurious noise that is the largest spectral component
excluding the input signal and DC. This value is expressed
in decibels relative to the RMS value of a full scale input
signal.
Full Power Bandwidth
The full power bandwidth is that input frequency at which
the amplitude of the reconstructed fundamental is re-
duced by 3dB for a full scale input signal.
Aperture Delay Time
The time from when a rising ENC
to the instant that the input signal is held by the sample and
hold circuit.
Aperture Delay Jitter
The variation in the aperture delay time from conversion to
conversion. This random variation will result in noise
when sampling an AC input. The signal to noise ratio due
to the jitter alone will be:
SNR
CONVERTER OPERATION
As shown in Figure 1, the LTC2220/LTC2221 is a CMOS
pipelined multistep converter. The converter has five
pipelined ADC stages; a sampled analog input will result in
a digitized value five cycles later (see the Timing Diagram
section). For optimal AC performance the analog inputs
should be driven differentially. For cost sensitive applica-
tions, the analog inputs can be driven single-ended with
slightly worse harmonic distortion. The encode input is
differential for improved common mode noise immunity.
The LTC2220/LTC2221 has two phases of operation,
determined by the state of the differential ENC
pins. For brevity, the text will refer to ENC
ENC
–
JITTER
as ENC high and ENC
= –20log (2π • f
IN
+
less than ENC
• t
JITTER
+
equals the ENC
)
+
–
+
greater than
as ENC low.
/ENC
–
voltage
–
input
22201fa