LTC1657LIGN - 16-Bit Rail-to-Rail DAC, 28-SSOP | Analog Devices
Référence : LTC1657LIGN ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $16.42 | $16,42 |
| 10 | $14.95 | $149,50 |
| 100 | $13.12 | $1 312,00 |
| 500 | $11.85 | $5 925,00 |
| 1 000 | $10.74 | $10 740,00 |
LTC1657LIGN Présentation
A digital-to-analog converter (DAC) is an integrated circuit that converts a digital code word into a precisely defined analog voltage or current. Within the broader signal-chain taxonomy, the LTC1657 belongs to the precision converter family -> data converter -> mixed-signal IC -> semiconductor. The LTC1657 specifically targets low-power, high-resolution applications where a parallel microprocessor-style interface is preferred for fast code updates without serial-clock overhead.
Key features include guaranteed 16-bit monotonicity over temperature, maximum DNL of ±1 LSB, internal power-on reset to zero scale, an asynchronous CLR pin for output forcing, and a built-in 1.25 V reference accessible at the REFOUT pin (LTC1657L variant). The device accepts a parallel 16-bit word and updates the output on the rising edge of CS/WR. Settling time to ±1 LSB is specified at 20 us for a full-scale step. The SSOP-28 footprint is industry-standard and compatible with the LTC1450 12-bit family, providing an upgrade path for existing designs.
Architecturally, the LTC1657LIGN uses a resistor-string (R-2R ladder) topology with an output buffer amplifier, ensuring inherently monotonic operation and low glitch impulse. The reference input can be driven externally or tied to the internal 1.25 V bandgap via REFOUT, providing design flexibility for both ratiometric and absolute-output applications.
Typical applications include industrial process control, digital offset and gain adjustment, automatic test equipment (ATE) programmable stimulus, audio attenuators with parallel volume control, and portable battery-powered instrumentation where the 650 uA quiescent current extends operating life. The wide supply range and rail-to-rail output maximize signal swing on low-voltage rails.
When designing with this device, ensure the REFLO pin is tied to GND and that bypass capacitors of 0.1 uF and 10 uF are placed close to VCC. The asynchronous CLR pin must be held high during normal operation to avoid unintended reset events. Designers migrating from the LTC1450 12-bit family benefit from pin-compatibility and only need to extend the data bus from 12 to 16 bits.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for evaluation, sourcing, and PCB layout reuse.
Alternatives de remplacement direct pour LTC1657LIGN — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC1657LIGN#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC1657LCGN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC1657LIGN#TR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC1657CGN#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC1450CGN#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC1657LIGN Valeurs maximales et caractéristiques électriques
| Résolution | 16 bit |
| Number of Channels | 1 |
| Supply Voltage (VCC) | 2.7 V to 5.5 V (LTC1657L) |
| Supply Current (ICC) | 650 uA typical |
| DNL (Differential Non-Linearity) | ±1 LSB max |
| Type de sortie | Voltage, rail-to-rail |
| Output Voltage Swing | Within 8 mV of either rail |
| Internal Reference | 1.25 V (LTC1657L) |
| Reference Input Range (REFHI/REFLO) | 0 V to VCC |
| Interface | Parallel (16-bit) |
| Power-On Reset | Yes, to zero scale |
| Asynchronous CLR Pin | Yes |
| Monotonicity | 16-bit guaranteed over temperature |
| Température de fonctionnement | -40 C to +85 C (industrial) |
| Boîtier | 28-SSOP (GN) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (#PBF suffix) |
Configuration des broches de LTC1657LIGN
| Broche 1 | VOUT — DAC analog voltage output |
| Broche 2 | REFOUT — Internal 1.25 V reference output (LTC1657L) |
| Broche 3 | REFHI — Reference input high |
| Broche 4 | REFLO — Reference input low |
| Broche 5 | GND — Analog ground |
| Broche 6 | CLR — Asynchronous clear (active low, output to zero) |
| Broche 7 | WR — Write strobe (active low) |
| Broche 8 | CS — Chip select (active low) |
| Broche 9 | D15 — Data bit 15 (MSB) |
| Broche 10 | D14 — Data bit 14 |
| Broche 11 | D13 — Data bit 13 |
| Broche 12 | D12 — Data bit 12 |
| Broche 13 | D11 — Data bit 11 |
| Broche 14 | D10 — Data bit 10 |
| Broche 15 | D9 — Data bit 9 |
| Broche 16 | D8 — Data bit 8 |
| Broche 17 | D7 — Data bit 7 |
| Broche 18 | D6 — Data bit 6 |
| Broche 19 | D5 — Data bit 5 |
| Broche 20 | D4 — Data bit 4 |
| Broche 21 | D3 — Data bit 3 |
| Broche 22 | D2 — Data bit 2 |
| Broche 23 | D1 — Data bit 1 |
| Broche 24 | D0 — Data bit 0 (LSB) |
| Broche 25 | NC — Not connected (per datasheet) |
| Broche 26 | NC — Not connected (per datasheet) |
| Broche 27 | VCC — Positive supply (2.7 V to 5.5 V) |
| Broche 28 | GND — Digital ground |
Applications typiques
LTC1657LIGN convient pour 6 applications: Industrial Process Control, Digital Offset and Gain Adjustment, Automatic Test Equipment (ATE) Programmable Stimulus, Audio Attenuator with Parallel Volume Control, Portable Battery-Powered Instrumentation, Programmable Voltage Reference.
Industrial Process Control
The LTC1657LIGN delivers 16-bit monotonic output with ±1 LSB DNL and 650 uA typical supply current, making it well-suited for 4-20 mA current-loop DAC stages and programmable setpoint generators in PLC analog output cards. The parallel 16-bit interface allows fast code updates from a microcontroller without serial-clock overhead, and the rail-to-rail output maximizes dynamic range on 5 V analog rails. Per the Analog Devices datasheet typical application circuit, a single 0.1 uF/10 uF bypass network on VCC and the internal 1.25 V reference tied to REFHI yields a 0-5 V output without external components. Industrial temperature grade (-40 C to +85 C) ensures operation in factory-floor enclosures without derating.
Recommandé
Digital Offset and Gain Adjustment
The LTC1657LIGN provides 16-bit (65536-step) resolution with ±1 LSB DNL, enabling fine trim of system offset and gain errors in instrumentation and ATE stimulus paths. The parallel data bus accepts update codes directly from a microcontroller or FPGA, and the asynchronous CLR pin forces the output to zero on demand for calibration resets. According to the Analog Devices datasheet, the output buffer drives 5 mA into a 2 kohm load with low code-dependent load regulation, making it suitable for trimming precision op-amp offset voltages and reference-trim applications. The 650 uA supply current allows use in battery-powered calibration fixtures.
Recommandé
Automatic Test Equipment (ATE) Programmable Stimulus
The LTC1657LIGN's parallel 16-bit interface and 16-bit monotonic output enable fast code-update stimulus generation in ATE pin-electronics and bench instruments. The device settles to ±1 LSB within 20 us (per Analog Devices datasheet typical specs), and the rail-to-rail output swings within 8 mV of either rail, maximizing headroom on 5 V test rails. The SSOP-28 footprint allows dense placement on multi-channel ATE boards. Per the typical application circuit, driving REFOUT into REFHI and tying REFLO to GND eliminates the need for an external reference, reducing BOM cost and board area in high-channel-count ATE systems.
Recommandé
Audio Attenuator with Parallel Volume Control
The LTC1657LIGN functions as a digitally controlled attenuator in audio mixer consoles and digital volume-control applications, where its 16-bit resolution provides 96 dB of attenuation range in 0.0015 dB steps. The parallel data bus accepts direct updates from front-panel encoder logic. According to the Analog Devices datasheet, the output buffer drives 5 mA into 2 kohm with low noise, making it suitable for line-level audio paths. Rail-to-rail output maximizes headroom on 5 V analog supply rails commonly found in professional audio equipment. The micropower 650 uA supply current suits portable recording gear and battery-powered mixers.
Recommandé
Portable Battery-Powered Instrumentation
The LTC1657LIGN's 650 uA typical supply current extends battery life in handheld DMMs, portable data loggers, and field instrumentation where every microamp matters. The 2.7 V to 5.5 V single-supply range accommodates 3.3 V and 5 V systems powered from Li-ion or USB rails. Per the Analog Devices datasheet, the internal 1.25 V reference eliminates the need for an external reference IC, reducing BOM and standby current. The 28-SSOP package occupies minimal PCB area in space-constrained handheld enclosures, and the rail-to-rail output maximizes usable dynamic range on low-battery rails as VCC drops.
Recommandé
Programmable Voltage Reference
The LTC1657LIGN can be configured as a programmable precision voltage reference by tying REFOUT into REFHI and driving REFLO to GND, yielding a 0 to VCC output range with 16-bit resolution. This setup replaces mechanical potentiometers in precision analog designs and allows software-controlled calibration of system gains. According to the Analog Devices datasheet, the output buffer maintains low impedance up to 5 mA, suitable for driving reference inputs of precision ADCs and op-amp offset trim networks. The industrial temperature grade (-40 C to +85 C) ensures stable output across operating environments.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC1657LIGN — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC1657LIGN#PBF | LTC1657LCGN | LTC1657LIGN#TR | LTC1657CGN#PBF | LTC1450CGN#PBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SSOP (GN) | 28-SSOP (GN) - same | 28-SSOP (GN) - same | 28-SSOP (GN) - same | 28-SSOP (GN) - same | 28-SSOP (GN) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 12 bit (downgrade) |
| Internal Reference | 1.25 V (L variant) | 1.25 V | 1.25 V | 1.25 V | No (non-L) | 2.048 V (LTC1450L) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V |
| DNL (max) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB (12-bit scaled) |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | 0 C to +70 C (commercial) | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C (C grade) |
| Interface | Parallel (16-bit) | Parallel 16-bit | Parallel 16-bit | Parallel 16-bit | Parallel 16-bit | Parallel 12-bit |
| Output Type | Rail-to-rail voltage | Rail-to-rail voltage | Rail-to-rail voltage | Rail-to-rail voltage | Rail-to-rail voltage | Voltage (not rail-to-rail) |
Principaux différenciateurs
- Lower power consumption than most parallel 16-bit DACs (vs LTC1450CGN#PBF)
- Rail-to-rail output swings within 8 mV of either rail (vs LTC1450CGN#PBF)
- Internal 1.25 V reference eliminates external reference BOM (vs LTC1657CGN#PBF)
Notes de conception
Place a 0.1 uF ceramic capacitor in parallel with a 10 uF low-ESR (tantalum or ceramic) capacitor within 0.25 inch of the VCC pin. According to the Analog Devices LTC1657 datasheet, inadequate bypass capacitance results in increased output noise and code-dependent load regulation errors. Both capacitors should be rated for the operating temperature range to maintain stability across industrial environments.
The asynchronous CLR pin must be held high (inactive) during normal operation. Floating the CLR pin can result in unintended output resets to zero scale. Per the datasheet, the CLR pin is internally pulled, but an external 10 kohm pull-up to VCC is recommended for high-noise industrial environments. Designers migrating from the LTC1450 12-bit family must extend the data bus from 12 to 16 bits - leaving the upper 4 bits (D12-D15) floating can cause indeterminate output states.
Route the parallel data bus (D0-D15) with matched trace impedance and keep them away from noisy switching traces. Per the Analog Devices typical application circuit, place the LTC1657LIGN close to the microcontroller or FPGA that drives it to minimize bus capacitance. Ground the SSOP exposed pad (if present on the package variant) to a low-impedance ground plane to reduce thermal resistance and provide a low-noise reference for the analog output stage.
Informations de conformité
Lead-free RoHS compliance confirmed by #PBF suffix per Analog Devices ordering information. The non-PBF LTC1657LIGN variant may not be lead-free; the #PBF or #TR suffix should be specified for new designs.
