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參數資料
| 型號： | AD7840BQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Complete 14-Bit DAC |
| 中文描述： | SERIAL, PARALLEL, WORD INPUT LOADING, 2.5 us SETTLING TIME, 14-BIT DAC, CDIP24 |
| 封裝： | HERMETIC SEALED, CERDIP-24 |
| 文件頁數： | 5/16頁 |
| 文件大?。?/td> | 337K |
| 代理商： | AD7840BQ |
AD7840
REV. B
–5–
PIN CONFIGURAT IONS
DIP/SSOP
PLC C
for external use, it should he decoupled to AGND with a 200
resistor in series with a parallel combination of a 10
μ
F tantalum
capacitor and a 0.1
μ
F ceramic capacitor.
Figure 2. Internal Reference
E X T E RNAL RE FE RE NCE
In some applications, the user may require a system reference or
some other external reference to drive the AD7840 reference in-
put. Figure 3 shows how the AD586 5 V reference can be con-
ditioned to provide the 3 V reference required by the AD7840
REF IN. An alternate source of reference voltage for the
AD7840 in systems which use both a DAC and an ADC is to
use the REF OUT voltage of ADCs such as the AD7870 and
AD7871. A circuit showing this arrangement is shown in
Figure 20.
Figure 3. AD586 Driving AD7840 REF IN
D/A SE CT ION
T he AD7840 contains a 14-bit voltage mode D/A converter
consisting of highly stable thin film resistors and high speed
NMOS single-pole, double-throw switches. T he simplified cir-
cuit diagram for the DAC section is shown in Figure 1. T he
three MSBs of the data word are decoded to drive the seven
switches A–G. T he 11 LSBs switch an 11-bit R-2R ladder struc-
ture. T he output voltage from this converter has the same polar-
ity as the reference voltage, REF IN.
T he REF IN voltage is internally buffered by a unity gain ampli-
fier before being applied to the D/A converter and the bipolar
bias circuitry. T he D/A converter is configured and sealed for a
3 V reference and the device is tested with 3 V applied to REF
IN. Operating the AD7840 at reference voltages outside the
±
5% tolerance range may result in degraded performance from
the part.
Figure 1. DAC Ladder Structure
INT E RNAL RE FE RE NCE
T he AD7840 has an on-chip temperature compensated buried
Zener reference (see Figure 2) which is factory trimmed to 3 V
±
10 mV. T he reference voltage is provided at the REF OUT
pin. T his reference can be used to provide both the reference
voltage for the D/A converter and the bipolar bias circuitry. T his
is achieved by connecting the REF OUT pin to the REF IN pin
of the device.
T he reference voltage can also be used as a reference for other
components and is capable of providing up to 500
μ
A to an ex-
ternal load. T he maximum recommended capacitance on REF
OUT for normal operation is 50 pF. If the reference is required
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