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AD7684BRMZRL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
AD7684
Rev. A | Page 6 of 16
ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter Rating
Analog Inputs
+IN
1
, −IN
1
GND − 0.3 V to VDD + 0.3 V
or ±130 mA
REF GND − 0.3 V to VDD + 0.3 V
Supply Voltages
VDD to GND −0.3 V to +6 V
Digital Inputs to GND −0.3 V to VDD + 0.3 V
Digital Outputs to GND −0.3 V to VDD + 0.3 V
Storage Temperature Range −65°C to +150°C
Junction Temperature 150°C
θ
JA
Thermal Impedance 200°C/W
θ
JC
Thermal Impedance 44°C/W
Lead Temperature JEDEC J-STD-20
1
See the Analog Inputs section.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
AD7684
Rev. A | Page 7 of 16
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
04302-006
REF
1
+IN
2
–IN
3
GND
4
VDD
8
DCLOCK
7
D
OUT
6
CS
5
AD7684
TOP VIEW
(Not to Scale)
Figure 6. 8-Lead MSOP Pin Configuration
Table 7. Pin Function Descriptions
Pin No. Mnemonic Type
1
Description
1 REF AI
Reference Input Voltage. The REF range is from 0.5 V to VDD. This pin is referred to the GND pin and
should be decoupled closely to the GND pin with a ceramic capacitor of a few μF.
2 +IN AI
Differential Positive Analog Input. Referenced to −IN. The input range for +IN is between 0 V and V
REF
,
centered about V
REF
/2 and must be driven 180° out of phase with −IN.
3 –IN AI
Differential Negative Analog Input. Referenced to +IN. The input range for −IN is between V
REF
and 0 V,
centered about V
REF
/2 and must be driven 180° out of phase with +IN.
4 GND P Power Supply Ground.
5
CS
DI
Chip Select Input. On its falling edge, it initiates the conversions. The part returns to shutdown mode as
soon as the conversion is complete. It also enables D
OUT
. When high, D
OUT
is high impedance.
6 D
OUT
DO Serial Data Output. The conversion result is output on this pin. It is synchronized to DCLOCK.
7 DCLOCK DI Serial Data Clock Input.
8 VDD P Power Supply.
1
AI = analog input, DI = digital input, DO = digital output, and P = power.
AD7684
Rev. A | Page 8 of 16
TERMINOLOGY
Integral Nonlinearity Error (INL)
Linearity error refers to the deviation of each individual code
from a line drawn from negative full scale through positive full
scale. The point used as negative full scale occurs ½ LSB before
the first code transition. Positive full scale is defined as a level
1½ LSB beyond the last code transition. The deviation is
measured from the middle of each code to the true straight line
(see
Figure 21).
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. DNL is the
maximum deviation from this ideal value. It is often specified in
terms of resolution for which no missing codes are guaranteed.
Zero Error
Zero error is the difference between the ideal midscale voltage,
that is, 0 V, and the actual voltage producing the midscale
output code, that is, 0 LSB.
Gain Error
The first transition (from 100 . . . 00 to 100 . . . 01) should
occur at a level ½ LSB above the nominal negative full scale
(−4.999924 V for the ±5 V range). The last transition (from
011…10 to 011…11) should occur for an analog voltage
1½ LSB below the nominal full scale (4.999771 V for the ±5 V
range). The gain error is the deviation of the difference between
the actual level of the last transition and the actual level of the
first transition from the difference between the ideal levels.
Spurious-Free Dynamic Range (SFDR)
SFDR is the difference, in decibels (dB), between the rms
amplitude of the input signal and the peak spurious signal.
Effective Number of Bits (ENOB)
ENOB is a measurement of the resolution with a sine wave
input. It is related to SINAD by the following formula
ENOB = (SINAD
dB
− 1.76)/6.02
and is expressed in bits.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first five harmonic
components to the rms value of a full-scale input signal and is
expressed in dB.
Signal-to-Noise Ratio (SNR)
SNR is the ratio of the rms value of the actual input signal to the
rms sum of all other spectral components below the Nyquist
frequency, excluding harmonics and dc. The value for SNR is
expressed in dB.
Signal-to-(Noise + Distortion) Ratio (SINAD)
SINAD is the ratio of the rms value of the actual input signal to
the rms sum of all other spectral components below the Nyquist
frequency, including harmonics but excluding dc. The value for
SINAD is expressed in dB.
Aperture Delay
Aperture delay is a measure of the acquisition performance and
is the time between the falling edge of the
CS
input and when
the input signal is held for a conversion.
Transient Response
Transient response is the time required for the ADC to accurately
acquire its input after a full-scale step function is applied.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

AD7684BRMZRL7

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Analog to Digital Converters - ADC 16-BIT 100 kSPS
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