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| 型號(hào)： | AD7622 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC |
| 中文描述： | 16位，750 kSPS的，單極/雙極可編程輸入PulSAR系列ADC的 |
| 文件頁(yè)數(shù)： | 21/32頁(yè) |
| 文件大小： | 587K |
| 代理商： | AD7622 |
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AD7612
DRIVER AMPLIFIER CHOICE
Rev. 0 | Page 21 of 32
Although the AD7612 is easy to drive, the driver amplifier must
meet the following requirements:
For multichannel, multiplexed applications, the driver
amplifier and the AD7612 analog input circuit must be
able to settle for a full-scale step of the capacitor array at
a 16-bit level (0.0015%). For the amplifier, settling at 0.1%
to 0.01% is more commonly specified. This differs signifi-
cantly from the settling time at a 16-bit level and should
be verified prior to driver selection. The
AD8021
op amp
combines ultra-low noise and high gain bandwidth and
meets this settling time requirement even when used with
gains of up to 13.
The noise generated by the driver amplifier needs to be
kept as low as possible to preserve the SNR and transition
noise performance of the AD7612. The noise coming from
the driver is filtered by the external 1-pole low-pass filter
as shown in Figure 27. The SNR degradation due to the
amplifier is
(
)
π
2
+
=
2
3
2
log
20
N
dB
NADC
V
NADC
V
LOSS
Ne
f
SNR
where:
V
NADC
is the noise of the ADC, which is:
20
10
2
2
SNR
INp-p
V
NADC
V
=
f
–3dB
is the cutoff frequency of the input filter (3.9 MHz).
N
is the noise factor of the amplifier (+1 in buffer
configuration).
e
N
is the equivalent input voltage noise density of the op
amp, in nV/√Hz.
The driver needs to have a THD performance suitable to
that of the AD7612. Figure 15 shows the THD vs. frequency
that the driver should exceed.
The AD8021 meets these requirements and is appropriate for
almost all applications. The AD8021 needs a 10 pF external
compensation capacitor that should have good linearity as an
NPO ceramic or mica type. Moreover, the use of a noninverting
+1 gain arrangement is recommended and helps to obtain the
best signal-to-noise ratio.
The
AD8022
can also be used when a dual version is needed
and a gain of 1 is present. The
AD829
is an alternative in appli-
cations where high frequency (above 100 kHz) performance is not
required. In applications with a gain of 1, an 82 pF compensation
capacitor is required. The
AD8610
is an option when low bias
current is needed in low frequency applications.
Since the AD7612 uses a large geometry, high voltage input
switch, the best linearity performance is obtained when using
the amplifier at its maximum full power bandwidth. Gaining
the amplifier to make use of the more dynamic range of the
ADC results in increased linearity errors. For applications
requiring more resolution, the use of an additional amplifier
with gain should precede a unity follower driving the AD7612.
See Table 8 for a list of recommended op amps.
Table 8. Recommended Driver Amplifiers
Amplifier
Typical Application
ADA4841-x
12 V supply, very low noise, low distortion,
low power, low frequency
AD829
±15 V supplies, very low noise, low frequency
AD8021
±12 V supplies, very low noise, high frequency
AD8022
±12 V supplies, very low noise, high
frequency, dual
AD8610/AD8620
±13 V supplies, low bias current, low
frequency, single/dual
VOLTAGE REFERENCE INPUT/OUTPUT
The AD7612 allows the choice of either a very low temperature
drift internal voltage reference, an external reference or an external
buffered reference.
The internal reference of the AD7612 provides excellent perfor-
mance and can be used in almost all applications. However, the
linearity performance is guaranteed only with an external reference.
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