OPA684 低消費電力、電流帰還オペアンプ、ディスエーブル機能付 | TIJ.co.jp

OPA684
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低消費電力、電流帰還オペアンプ、ディスエーブル機能付

低消費電力、電流帰還オペアンプ、ディスエーブル機能付 - OPA684
データシート
 

概要

The OPA684 provides a new level of performance in low-power, wideband, current-feedback (CFB) amplifiers. This CFBplus amplifier is the first to use an internally closed-loop input buffer stage that enhances performance significantly over earlier low-power CFB amplifiers. While retaining the benefits of very low power operation, this new architecture provides many of the benefits of a more ideal CFB amplifier. The closed-loop input stage buffer gives a very low and linearized impedance path at the inverting input to sense the feedback error current. This improved inverting input impedance retains exceptional bandwidth to much higher gains and improves harmonic distortion over earlier solutions limited by inverting input linearity. Beyond simple high-gain applications, the OPA684 CFBplus amplifier permits the gain setting element to be set with considerable freedom from amplifier bandwidth interaction. This allows frequency response peaking elements to be added, multiple input inverting summing circuits to have greater bandwidth, and low-power line drivers to meet the demanding requirements of studio cameras and broadcast video.

The output capability of the OPA684 also sets a new mark in performance for low-power current feedback amplifiers. Delivering a full ±4Vpp swing on ±5V supplies, the OPA684 also has the output current to support this swing into a 100 load. This minimal output headroom requirement is complemented by a similar 1.2V input stage headroom giving exceptional capability for single +5V operation.

The OPA684’s low 1.7mA supply current is precisely trimmed at 25°C. This trim, along with low shift over temperature and supply voltage, gives a very robust design over a wide range of operating conditions. System power may be further reduced by using the optional disable control pin. Leaving this disable pin open, or holding it HIGH, gives normal operation. If pulled LOW, the OPA684 supply current drops to less than 100µA while the I/O pins go to a high impedance state.

特長

  • MINIMAL BANDWIDTH CHANGE VERSUS GAIN
  • > 120MHz BANDWIDTH TO GAIN > +10
  • LOW DISTORTION: < –78dBc at 5MHz
  • HIGH OUTPUT CURRENT: 120mA
  • SINGLE +5V TO +12V SUPPLY OPERATION
  • DUAL ±2.5 TO ±6.0V SUPPLY OPERATION
  • LOW SUPPLY CURRENT: 1.7mA
  • LOW SHUTDOWN CURRENT: 100µA
  • APPLICATIONS
    • LOW-POWER BROADCAST VIDEO DRIVERS
    • EQUALIZING FILTERS
    • SAW FILTER HIGH GAIN POST AMPLIFIERS
    • MULTICHANNEL SUMMING AMPLIFIERS
    • PROFESSIONAL CAMERAS
    • ADC INPUT DRIVERS

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機能一覧

他の製品と比較 高速オペアンプ (GBW>=50MHz) メール Excelへダウンロード
Part number オーダー・オプション Architecture Number of channels (#) Total supply voltage (Min) (+5V=5, +/-5V=10) Total supply voltage (Max) (+5V=5, +/-5V=10) GBW (Typ) (MHz) BW @ Acl (MHz) Acl, min spec gain (V/V) Slew rate (Typ) (V/us) Vn at flatband (Typ) (nV/rtHz) Vn at 1 kHz (Typ) (nV/rtHz) Iq per channel (Typ) (mA) Vos (offset voltage @ 25 C) (Max) (mV) Rail-to-rail Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) CMRR (Typ) (dB) Input bias current (Max) (pA) Offset drift (Typ) (uV/C) Output current (Typ) (mA) 2nd harmonic (dBc) 3rd harmonic (dBc) @ MHz
OPA684 ご注文 Current FB     1     5     12     210     210     1     820     3.7     3.7     1.7     3.5     No     Shutdown     Catalog     -40 to 85     SOIC | 8
SOT-23 | 6    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
60     10000000     12     120     67     70     5    
OPA2684 サンプルは利用できません。 Current FB     2     5     12     210     210     1     820     3.7     3.7     1.7     3.5     No       Catalog     -40 to 125     SOIC | 8
SOT-23 | 8    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 8)    
60     10000000     12     120     67     70     5    
OPA3684 サンプルは利用できません。 Current FB     3     5     12     210     210     1     820     3.7     3.7     1.7     3.5     No     Shutdown     Catalog     -40 to 85     SOIC | 14
SSOP | 16    
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)
16SSOP: 29 mm2: 6 x 4.9 (SSOP | 16)    
60     10000000     12     120     67     70     5    
OPA4684 サンプルは利用できません。 Current FB