AD6644ASTZ-65 Analog Devices Inc, AD6644ASTZ-65 Datasheet - Page 17

• Manufacturer Part Number: AD6644ASTZ-65
• Description: IC ADC 14BIT 65MSPS CMOS 52-LQFP
• Manufacturer: Analog Devices Inc

Specifications of AD6644ASTZ-65

• Data Interface: Parallel
• Number Of Bits: 14
• Sampling Rate (per Second): 65M
• Number Of Converters: 4
• Power Dissipation (max): 1.3W
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 52-LQFP
• Resolution (bits): 14bit
• Sampling Rate: 65MSPS
• Input Channel Type: Differential
• Supply Voltage Range - Digital: 3V To 3.6V
• Supply Current: 245mA
• Number Of Elements: 1
• Resolution: 14Bit
• Architecture: Pipelined
• Sample Rate: 65MSPS
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: ±1.1V
• Differential Input: Yes
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.85V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 1.5W
• Differential Linearity Error: -1LSB/1.5LSB
• Integral Nonlinearity Error: ±0.5LSB(Typ)
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 52
• Package Type: LQFP
• Input Signal Type: Differential
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Jitter Considerations
The signal-to-noise ratio (SNR) for an ADC can be predicted.
When normalized to ADC codes, Equation 1 accurately
predicts the SNR based on three terms. These are jitter, average
DNL error, and thermal noise. Each of these terms contributes
to the noise within the converter (see Equation 1).
where:
f
t
and internal encode circuitry).
ε is the average DNL of the ADC (typically 0.41 LSB).
n is the number of bits in the ADC.
V
of the ADC (typically 2.5 LSB).
ANALOG
j rms
NOISE rms
is the rms jitter of the encode (rms sum of encode source
SNR
is the analog input frequency.
is the V rms thermal noise referred to the analog input
=
−
⎛
⎜
⎜
⎝
20
V
NOISE
×
2
log
n
rms
⎡
⎢
⎣
⎛ +
⎜
⎝
1
⎞
⎟
⎟
⎠
2
2
n
⎤
⎥
⎥
⎦
ε
1
2 /
⎞
⎟
⎠
2
+
(
2
π
×
f
ANALOG
×
t
j
rms
)
2
+
Rev. D | Page 17 of 24
(1)
For a 14-bit ADC like the AD6644, aperture jitter can greatly
affect the SNR performance as the analog frequency is
increased. Figure 31 shows a family of curves that demonstrates
the expected SNR performance of the AD6644 as jitter increases
and is derived from Equation 1.
For a complete review of aperture jitter, see Application Note
AN-756, Sampled Systems and the Effects of Clock Phase Noise
and Jitter, at www.analog.com.
80
75
70
65
60
55
0
AIN = 110MHz
0.1
Figure 31. SNR vs. Jitter
0.2
JITTER (ps)
AIN = 150MHz
0.3
AIN = 30MHz
AIN = 190MHz
0.4
AIN = 70MHz
0.5
AD6644
0.6