AD9850BRS Electronics IC Chip Integrated Circuit Chip
CMOS, 125 MHz Complete DDS Synthesizer
STOCK LIST
| LF355 | NSC | 16+ | DIP-8 |
| SFC2309-200WC | SEMTECH | 16+ | BGA |
| LP2950CZ-3.0 | NSC | 16+ | TO-92 |
| HFA08TB60 | IR | 15+ | TO-220 |
| BT151-500R | PHI | 16+ | TO-220 |
| PIC18F452-IP | MIC | 16+ | DIP-40 |
| LF356 | NSC | 16+ | DIP-8 |
| 74LS83 | HIT | 14+ | DIP-16 |
| 74LS155 | TI | 16+ | DIP-16 |
| L298H | ST | 15+ | ZIP-15 |
| 8255 | NEC | 15+ | DIP-40 |
| 74HC153 | TI | 16+ | DIP |
Feature
125 MHz Clock Rate On-Chip High Performance DAC and High Speed
Comparator DAC SFDR > 50 dB @ 40 MHz AOUT 32-Bit
Frequency Tuning Word Simplified Control Interface: Parallel Byte
or Serial Loading Format Phase Modulation Capability +3.3 V or +5 V
Single Supply Operation Low Power: 380 mW @ 125 MHz (+5 V) Low
Power: 155 mW @ 110 MHz (+3.3 V)
Power-Down Function Ultrasmall 28-Lead SSOP Packaging APPLICATIONS
Frequency/Phase–Agile Sine-Wave Synthesis Clock Recovery and
Locking Circuitry for Digital Communications Digitally Controlled
ADC Encode Generator Agile Local Oscillator Applications
PRODUCT HIGHLIGHTS
1. The AD698 offers a single chip solution to LVDT signal
conditioning problems. All active circuits are on the monolithic
chip with only passive components required to complete the
conversion from mechanical position to dc voltage.
2. The AD698 can be used with many different types of position
sensors. The circuit is optimized for use with any LVDT, including
half-bridge and series opposed, (4 wire) configurations. The AD698
accommodates a wide range of input and output voltages and
frequencies.
3. The 20 Hz to 20 kHz excitation frequency is determined by a
single external capacitor. The AD698 provides up to 24 volts rms to
differentially drive the LVDT primary, and the AD698 meets its
specifications with input levels as low as 100 millivolts rms.
4. Changes in oscillator amplitude with temperature will not affect
overall circuit performance. The AD698 computes the ratio of the
secondary voltage to the primary voltage to determine position and
direction. No adjustments are required.
5. Multiple LVDTs can be driven by a single AD698 either in series
or parallel as long as power dissipation limits are not exceeded.
The excitation output is thermally protected.
6. The AD698 may be used as a loop integrator in the design of
simple electromechanical servo loops.
7. The sum of the transducer secondary voltages do not need to be
constant.
ABSOLUTE MAXIMUM RATINGS
Maximum Junction Temperature . . . . . . . . . . . . . . . +165°C
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . +6 V
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . .
–0.7 V to +VS
Digital Output Continuous Current . . . . . . . . . . . . . . . 5
mA
DAC Output Current . . . . . . . . . . . . . . . . . . . . . . . .
. 30 mA
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to
+150°C
Operating Temperature . . . . . . . . . . . . . . . . . –40°C to
+85°C
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . +300°C
SSOP θJA Thermal Impedance . . . . . . . . . . . . . . . . . .
82°C/W
