LTC1067IGN - Dual Switched-Cap Filter 20kHz | Analog Devices
N.º da peça: LTC1067IGN ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.38 | $6,38 |
| 10 | $5.95 | $59,50 |
| 100 | $5.42 | $542,00 |
| 500 | $4.88 | $2.440,00 |
| 1.000 | $4.35 | $4.350,00 |
LTC1067IGN Visão geral
What is a switched-capacitor filter? A switched-capacitor filter is an active filter topology that emulates a resistor using a capacitor switched at a clock frequency, allowing precise, monolithic filter implementations without external precision capacitors. Within the broader IC taxonomy, switched-capacitor filters fall under active filters -> analog filters -> signal conditioning -> analog ICs -> semiconductors. They are preferred over continuous-time active filters for applications requiring tight frequency accuracy relative to an external clock.
Key features include a clock-to-cutoff ratio of 100:1 (the LTC1067-50 variant uses 50:1), rail-to-rail input and output swing that maximizes dynamic range on low-voltage supplies, 60 dB signal-to-noise ratio, and a low noise floor suitable for instrumentation-grade signal chains. Each second-order block uses five external resistors, allowing independent configuration as a low-pass, high-pass, band-pass, or notch stage. Two blocks can be cascaded externally to build a 4th-order filter.
The architecture is built on Analog Devices' precision switched-capacitor technology with CMOS analog switches and on-chip clock generation. The clock input accepts a TTL or CMOS external source, and the internal master clock divider sets the filter cutoff, simplifying design-in when synchronization to a system clock is required. The dual-block topology also enables independent filtering of two channels, such as stereo audio or dual-axis sensor signals, in a single IC.
Typical applications include antialiasing filters for 16-bit ADCs, smoothing filters for DAC outputs, dual-channel audio crossover networks, instrumentation low-pass filters in data acquisition systems, and ultrasonic transducer front-end filtering in medical imaging. The wide dynamic range makes the LTC1067IGN particularly attractive when the upstream signal already spans most of the supply range.
When designing with this part, plan clock-to-cutoff ratio carefully: the cutoff frequency equals fCLK/100 (or /50 for the -50 variant). A stable, low-jitter clock is essential - phase noise on the clock translates directly into passband distortion. Keep clock traces short and away from analog signal traces to prevent coupling.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet's typical application circuits.
Alternativas drop-in para LTC1067IGN — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LTC1067CGN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1067CGN#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1067IGN#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1067-50CGN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1067-50IGN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC1067IGN Classificações máximas e características elétricas
| Filter Type | Universal Switched Capacitor, 2nd Order (dual block) |
| Number of Filters | 2 (independent 2nd-order sections) |
| Filter Order | 4th Order (cascadable) |
| Maximum Cutoff Frequency | 20 kHz |
| Clock-to-Cutoff Ratio | 100:1 (LTC1067); 50:1 (LTC1067-50) |
| Input Signal Range | Rail-to-Rail |
| Output Signal Range | Rail-to-Rail |
| Signal-to-Noise Ratio | 60 dB (typical) |
| Encapsulamento | 16-pin SSOP (narrow) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (#PBF suffix) |
| Lead-Free | Yes (#PBF suffix) |
| Número de pinos | 16 |
| Filter Functions | Low-pass, High-pass, Band-pass, Notch (with external resistors) |
Configuração de pinos do LTC1067IGN
| Pino 1 | INA — Input of filter block A |
| Pino 2 | SA — Summing node of filter block A |
| Pino 3 | GA — Gain node of filter block A |
| Pino 4 | QA — Output of op-amp A (filter block A output) |
| Pino 5 | VFA — Virtual ground for filter block A |
| Pino 6 | AGND — Analog ground |
| Pino 7 | CLK — External clock input |
| Pino 8 | V+ — Positive supply voltage |
| Pino 9 | AGND — Analog ground |
| Pino 10 | VFB — Virtual ground for filter block B |
| Pino 11 | QB — Output of op-amp B (filter block B output) |
| Pino 12 | GB — Gain node of filter block B |
| Pino 13 | SB — Summing node of filter block B |
| Pino 14 | INB — Input of filter block B |
| Pino 15 | V- — Negative supply voltage |
| Pino 16 | NC — Not connected (per datasheet) |
Aplicações típicas
LTC1067IGN é adequado para 6 aplicaçãos: Antialiasing Filter for 16-bit ADCs, DAC Smoothing Filter, Stereo Audio Crossover Network, Instrumentation Low-Pass Filter, Ultrasonic Transducer Front-End, Dual-Axis Sensor Signal Conditioning.
Antialiasing Filter for 16-bit ADCs
The LTC1067IGN's 20 kHz maximum cutoff, 60 dB SNR, and rail-to-rail dynamic range make it ideal for antialiasing filters placed in front of 16-bit ADCs in data-acquisition systems. Each 2nd-order block attenuates alias components above the Nyquist frequency while preserving signal amplitude and phase in the passband. With a 100:1 clock-to-cutoff ratio, designers can synchronize the filter cutoff to the ADC sample clock, simplifying system timing. Cascading both blocks delivers a 4th-order response with 80 dB/decade roll-off.
Recomendado
DAC Smoothing Filter
The LTC1067IGN serves as a reconstruction (smoothing) filter on the output of audio or instrumentation DACs, removing the images and quantization steps that appear at multiples of the DAC update rate. Rail-to-rail output swing preserves the full dynamic range of modern low-voltage DACs, while the 60 dB SNR keeps the filter transparent to the underlying signal. Designers typically configure the LTC1067 as a low-pass filter with cutoff just above the audio band (44.1 kHz for 44.1 kHz sample rate DACs).
Recomendado
Stereo Audio Crossover Network
The LTC1067IGN's two independent filter blocks enable a two-way stereo crossover in a single IC, splitting each channel into woofer (low-pass) and tweeter (high-pass) bands. The 20 kHz maximum cutoff covers the full audio range, while the rail-to-rail signal path preserves dynamic range on 5V or 3.3V supplies. Designers use the 100:1 clock-to-cutoff ratio to set crossover frequency precisely, and the matched dual blocks ensure channel-to-channel phase alignment within a fraction of a degree.
Recomendado
Instrumentation Low-Pass Filter
For precision instrumentation front-ends, the LTC1067IGN provides a low-noise, high-dynamic-range low-pass filter that rejects 50/60 Hz mains hum and high-frequency EMI before the signal reaches the measurement ADC. Rail-to-rail input swing accommodates bridge, thermocouple, and current-shunt signals spanning most of the supply range. The 60 dB SNR keeps the filter transparent to sub-microvolt signals, and the 100:1 clock-to-cutoff ratio lets designers lock the cutoff to the line frequency for fixed mains rejection.
Recomendado
Ultrasonic Transducer Front-End
The LTC1067IGN's 20 kHz cutoff (extendable with the -50 ratio variant) suits ultrasonic transducer front-ends operating in the 20-200 kHz range when clocked appropriately. The dual blocks allow band-pass filtering of the transmit burst on one channel and the receive echo on the other, sharing a single clock for synchronized timing. Rail-to-rail input handling preserves the dynamic range of piezoceramic transducer outputs, while the 60 dB SNR ensures weak echoes are not buried in filter noise.
Recomendado
Dual-Axis Sensor Signal Conditioning
The LTC1067IGN's two independent filter blocks enable simultaneous low-pass filtering of two sensor channels (X and Y axes from accelerometers, gyroscopes, or magnetic sensors) in a single 16-pin SSOP. Each block uses its own external resistors for per-channel cutoff tuning, while a shared external clock keeps both axes time-synchronized. Rail-to-rail I/O preserves dynamic range from 3.3V or 5V sensor rails, and the small SSOP footprint keeps the BOM compact for space-constrained IMUs.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LTC1067IGN — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LTC1067CGN | LTC1067CGN#PBF | LTC1067IGN#PBF | LTC1067-50CGN | LTC1067-50IGN |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-SSOP (narrow) | 16-SSOP (narrow) - same | 16-SSOP (narrow) - same | 16-SSOP (narrow) - same | 16-SSOP (narrow) - same | 16-SSOP (narrow) - same |
| Clock-to-Cutoff Ratio | 100:1 | 100:1 | 100:1 | 100:1 | 50:1 | 50:1 |
| Maximum Cutoff Frequency | 20 kHz | 20 kHz | 20 kHz | 20 kHz | 20 kHz (with 50:1 ratio) | 20 kHz (with 50:1 ratio) |
| Number of Filter Blocks | 2 (dual 2nd-order) | 2 (dual 2nd-order) | 2 (dual 2nd-order) | 2 (dual 2nd-order) | 2 (dual 2nd-order) | 2 (dual 2nd-order) |
| Signal-to-Noise Ratio | 60 dB | 60 dB | 60 dB | 60 dB | 60 dB | 60 dB |
| Input/Output Swing | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| RoHS Compliance | Depends on suffix (#PBF = RoHS) | Depends on suffix | Yes (#PBF suffix) | Yes (#PBF suffix) | Depends on suffix | Depends on suffix |
| Approx. 1ku Price (USD) | $6.38 | Similar (Analog Devices family) | Similar (Analog Devices family) | Similar (Analog Devices family) | Similar (Analog Devices family) | Similar (Analog Devices family) |
Principais diferenciais
- Dual independent 2nd-order blocks in one IC (vs Discrete op-amp + RC filter implementation)
- Clock-to-cutoff ratio matches LTC1067-50 family for tunable cutoff (vs LTC1067-50IGN (50:1 ratio variant))
- Rail-to-rail I/O preserves dynamic range on low-voltage supplies (vs Single-supply filter ICs with limited input swing)
Notas de projeto
Keep the external clock trace short and routed away from analog input and output traces to prevent digital clock edges from coupling into the passband. Place a 0.1uF decoupling capacitor close to each supply pin (V+ and V-) and add a 10uF bulk capacitor at the supply entry point. The AGND pin should connect to a low-impedance ground plane; avoid splitting the ground plane under the LTC1067IGN.
Clock-to-cutoff ratio confusion: a designer expecting 50:1 behavior from a standard LTC1067 will see the cutoff at half the intended frequency. Verify the part marking and datasheet before assuming the ratio. Also, do not exceed the maximum clock frequency for the chosen ratio, or the internal switched-capacitor network will introduce distortion in the passband.
For best SNR performance, keep the input signal amplitude in the upper half of the rail-to-rail range. The LTC1067's noise floor is approximately constant in microvolts RMS, so a larger input signal improves SNR by direct ratio. If the upstream signal is small, consider adding a fixed-gain amplifier stage (e.g. AD8055) before the LTC1067IGN input to maximize dynamic range.
Informações de conformidade
RoHS compliance requires #PBF suffix per Analog Devices ordering information. Standard LTC1067IGN may need #PBF suffix for RoHS compliance. AEC-Q100 not applicable for industrial-grade active filter IC.
