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參數資料
| 型號： | AD9446 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 80/100 MSPS ADC |
| 中文描述： | 16位，80/100 MSPS的模數轉換器 |
| 文件頁數： | 24/36頁 |
| 文件大小： | 952K |
| 代理商： | AD9446 |
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AD9446
THEORY OF OPERATION
The AD9446 architecture is optimized for high speed and ease
of use. The analog inputs drive an integrated, high bandwidth
track-and-hold circuit that samples the signal prior to quantization
by the 16-bit pipeline ADC core. The device includes an on-board
reference and input logic that accepts TTL, CMOS, or LVPECL
levels. The digital output logic levels are user selectable as standard
3 V CMOS or LVDS (ANSI-644 compatible) via the OUTPUT
MODE pin.
Rev. 0 | Page 24 of 36
ANALOG INPUT AND REFERENCE OVERVIEW
A stable and accurate 0.5 V band gap voltage reference is built
into the AD9446. The input range can be adjusted by varying
the reference voltage applied to the AD9446, using either the
internal reference or an externally applied reference voltage.
The input span of the ADC tracks reference voltage changes
linearly.
Internal Reference Connection
A comparator within the AD9446 detects the potential at the
SENSE pin and configures the reference into three possible states,
which are summarized in Table 9. If SENSE is grounded, the
reference amplifier switch is connected to the internal resistor
divider (see Figure 55), setting VREF to ~1.6 V. If a resistor
divider is connected as shown in Figure 56, the switch again sets
to the SENSE pin. This puts the reference amplifier in a
noninverting mode with the VREF output defined as
1
×
=
R1
R2
V
VREF
5
In all reference configurations, REFT and REFB drive the
analog-to-digital conversion core and establish its input span.
The input range of the ADC always equals twice the voltage at
the reference pin for either an internal or an external reference.
Internal Reference Trim
The internal reference voltage is trimmed during the production
test; therefore, there is little advantage to the user supplying an
external voltage reference to the AD9446. The gain trim is per-
formed with the AD9446 input range set to 3.2 V p-p nominal
(SENSE connected to AGND). Because of this trim and the
maximum ac performance provided by the 3.2 V p-p analog
input range, there is little benefit to using analog input ranges
<2 V p-p. However, reducing the range can improve SFDR
performance in some applications. Likewise, increasing the
range up to 3.8 V p-p can improve SNR. Users are cautioned
that the differential nonlinearity of the ADC varies with the
reference voltage. Configurations that use <2.0 V p-p may
exhibit missing codes and therefore degraded noise and
distortion performance.
10
μ
F+
0.1
μ
F
VREF
SENSE
0.5V
AD9446
VIN–
VIN+
REFT
0.1
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
REFB
SELECT
LOGIC
ADC
CORE
+
0
Figure 55. Internal Reference Configuration
0
10
μ
F+
0.1
μ
F
VREF
SENSE
R2
R1
0.5V
AD9446
VIN–
VIN+
REFT
0.1
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
REFB
SELECT
LOGIC
ADC
CORE
+
Figure 56. Programmable Reference Configuration
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